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The first century of Christianity witnessed one of the most remarkable transformations in religious history: a small Jewish movement centred on the life, death and resurrection of Jesus of Nazareth grew, within a few generations, into a faith established across the whole Roman Empire. For AQA A-Level candidates studying Christianity (Component 2, Section A), the apostolic age is foundational, because the decisions taken in these earliest decades — on who belongs to the people of God, on the authority of the apostles, on how the risen Christ is to be proclaimed — shaped every later development. This lesson examines the founding events recorded in the Acts of the Apostles, the conversion and missionary journeys of Paul, the Council of Jerusalem, the persecution endured under Rome, and the factors behind the faith's rapid spread.
According to Acts 2, the Christian Church was born at Pentecost, around fifty days after the resurrection. Luke describes the Holy Spirit descending on the apostles gathered in Jerusalem, enabling them to proclaim God's deeds in other languages. Peter then preached the first Christian sermon, declaring that the crucified Jesus had been raised and made "both Lord and Messiah" (Acts 2:36). Luke reports that around three thousand were baptised that day, forming the first Christian community.
The earliest Jerusalem church is characterised in Acts by several distinctive practices:
Key term: Ekklesia — the Greek word usually translated "church", meaning "assembly" or "those called out". In the New Testament it denotes the gathered community of believers, not a building.
Pentecost itself is theologically rich. Luke deliberately echoes the Old Testament: just as the gift of the Law at Sinai constituted Israel as God's people, so the gift of the Spirit at Pentecost constitutes the Church. The reversal of Babel is also in view — where once human languages were confused and scattered (Genesis 11), now people of many nations each hear the gospel in their own tongue, signalling that the good news is for all peoples. Peter interprets the event as the fulfilment of the prophecy of Joel that God would "pour out my Spirit on all flesh" (Acts 2:17, citing Joel 2:28). The Spirit, in Luke's account, is the power that drives the Church's mission outward from Jerusalem "to the ends of the earth" (Acts 1:8).
It is important to grasp that the earliest disciples did not understand themselves to be founding a new religion separate from Judaism. They were Jews who believed the Messiah had come. The eventual emergence of Christianity as a distinct faith was a gradual and contested process, and the decisive turning point was the question of Gentile inclusion.
One of the most consequential events in early Christianity was the Council of Jerusalem, described in Acts 15. The central question was whether Gentile (non-Jewish) converts needed to be circumcised and to keep the Mosaic Law in order to be full members of the Church. This was not a trivial ritual matter but a fundamental theological issue: was the gospel a renewal movement within Judaism, or a universal offer of salvation open to all peoples on equal terms through faith in Christ?
Two positions clashed. Some believers from a Pharisaic background insisted that "unless you are circumcised according to the custom of Moses, you cannot be saved" (Acts 15:1). Paul and Barnabas, by contrast, testified to what God had done among the Gentiles without the Law. Peter spoke in support of Gentile freedom, recalling his encounter with the household of Cornelius. James — described in the New Testament as the brother of Jesus and the leading figure in the Jerusalem church — gave the decisive judgement. Gentile converts would not be required to be circumcised, but they were asked to abstain "from things polluted by idols and from sexual immorality and from whatever has been strangled and from blood" (Acts 15:20; cf. 15:29).
The significance of this decision is difficult to overstate. By detaching membership of the people of God from the markers of Jewish identity, the council opened the way for the Gentile mission that would transform a Jewish movement into a world faith. The four prohibitions are best understood not as a new legal code but as measures to preserve table-fellowship between Jewish and Gentile believers.
It is worth noting that Paul gives his own account of these events in Galatians 2, which historians read alongside Acts 15. There Paul describes confronting Peter "to his face" at Antioch because Peter, having previously eaten with Gentile believers, withdrew from the shared table under pressure from those who came "from James" (Galatians 2:11–14). The "Antioch incident" shows that the principle of Gentile inclusion, even after the council, remained contested in practice: it was one thing to agree that Gentiles need not be circumcised, and another to work out whether Jewish and Gentile Christians could freely share meals. For Paul the issue was not mere etiquette but the very heart of the gospel — to compel Gentiles to live like Jews would imply that faith in Christ was insufficient for salvation. The episode underlines how the inclusion of the Gentiles was a hard-won and gradual achievement, not a single tidy resolution.
The apostle Paul (c. AD 5 – c. 64/67) is, after Jesus himself, the most important figure in the spread of early Christianity. Originally Saul of Tarsus, he was a zealous Pharisee who actively persecuted the Church — present at the stoning of Stephen and "breathing threats and murder against the disciples" (Acts 9:1). His transformation came through a dramatic experience on the road to Damascus (Acts 9; recounted again in Acts 22 and 26), in which the risen Christ confronted him with the words, "Saul, Saul, why do you persecute me?" Paul understood this encounter as a direct commissioning by the risen Lord to take the gospel to the Gentiles.
Key term: Apostle — literally "one sent out". In the New Testament the term applies primarily to the Twelve, but Paul insisted on his own apostleship on the grounds that he had seen the risen Christ and had been commissioned by him (1 Corinthians 9:1; Galatians 1:1).
Acts records three major missionary journeys, all departing from the church at Antioch in Syria:
Paul's strategy is itself worth noting. He concentrated on major cities — Antioch, Philippi, Corinth, Ephesus — that were administrative and commercial hubs, from which the gospel could radiate into the surrounding region along trade routes. He typically began in the synagogue, addressing Jews and the "God-fearers" (Gentiles attracted to Judaism), before turning to the wider Gentile population. He left behind small communities, kept in contact by letter and by co-workers such as Timothy and Titus, and supported himself by his trade as a tentmaker so as not to burden the churches (Acts 18:3). The journeys ended with Paul's arrest in Jerusalem and his being sent, as a Roman citizen who had appealed to Caesar, to Rome — where Acts leaves him preaching "with all boldness and without hindrance" (Acts 28:31), and where tradition holds he was martyred.
Paul's letters are the earliest Christian writings, predating the Gospels, and form a substantial portion of the New Testament. His theological contributions are immense:
Key term: Justification by faith — the Pauline teaching that sinful human beings are declared righteous before God not by their own works or obedience to the Law, but through faith in Christ. It became the cornerstone of Protestant theology.
If one message stood at the centre of the apostolic preaching (the kerygma), it was the proclamation that God had raised Jesus from the dead. The sermons in Acts repeatedly make the resurrection the decisive claim: "This Jesus God raised up, and of that all of us are witnesses" (Acts 2:32). For the apostles, the resurrection was not an isolated marvel but the vindication of Jesus — God's reversal of the verdict passed on him at the cross, the proof that the crucified one is indeed Lord and Messiah, and the ground of hope for the believer's own future resurrection.
Paul gives the fullest theological account. In 1 Corinthians 15 he sets out an early tradition he had himself received and passed on — that Christ died, was buried, and was raised on the third day "in accordance with the scriptures", appearing to Peter, to the Twelve, and to more than five hundred at once (1 Corinthians 15:3–8). He then argues that the resurrection of Christ and the future resurrection of believers stand or fall together: "if Christ has not been raised, your faith is futile and you are still in your sins" (1 Corinthians 15:17). The resurrection is thus the linchpin of Christian hope, and the courage of the martyrs is unintelligible without it.
This emphasis helps explain the dynamism of the early Church. The disciples did not preach a dead teacher's ethics but a living Lord; the experience of the risen Christ — supremely in Paul's own case on the Damascus road — transformed frightened followers into bold missionaries. For candidates, the resurrection is the point at which the historical spread of the Church and its theological convictions are inseparable: the message that drove the mission was itself a claim about what God had done.
The early Church faced opposition from both Jewish and Roman authorities, though for different reasons. Jewish opposition is recorded in the martyrdom of Stephen (Acts 7), the first Christian martyr, stoned for what was regarded as blasphemy, and in the execution of James the brother of John by Herod Agrippa I (Acts 12:2).
Roman persecution developed in stages and was, for most of the first two centuries, sporadic and local rather than systematic:
Persecution frequently strengthened rather than destroyed the Church. The North African writer Tertullian (c. AD 155 – c. 220) gave classic expression to this paradox: the steadfastness of those who died for their faith — the blood of the martyrs — became, in his striking phrase, "seed". The courage of the martyrs proved a powerful witness that drew others to convert.
It is worth noting that, for most of the first two centuries, Roman hostility was intermittent rather than constant. Christians attracted suspicion less for their specific beliefs than for what looked, to Roman eyes, like antisocial behaviour: they refused to honour the traditional gods or to offer sacrifice to the emperor's genius, which seemed both impious and politically disloyal; they met privately, which bred rumours of secret crimes; and their refusal to participate in civic religion appeared to endanger the pax deorum, the "peace of the gods" on which Rome's prosperity was thought to depend. The early-second-century correspondence between Pliny the Younger, governor of Bithynia, and the emperor Trajan shows a Roman official uncertain how to treat Christians: Trajan's reply directed that Christians were not to be hunted out, but that those duly accused and refusing to recant should be punished — a policy of restraint rather than systematic persecution.
The decisive change in the Church's fortunes came under Constantine. The Edict of Milan (AD 313) granted toleration to Christians, ending official persecution and inaugurating an era in which Christianity moved from a persecuted minority toward becoming the dominant faith of the empire. Under Theodosius I, by the end of the fourth century, Christianity became in effect the official religion of the Roman state — a transformation, from persecuted sect to established Church, of extraordinary rapidity.
Several factors help explain the remarkable expansion of the faith across the Mediterranean world:
No single factor is sufficient on its own. The infrastructure of empire explains how the message could travel, but not why it was accepted; the social appeal explains part of its attraction, but the same conditions were available to other cults that did not spread comparably. Historians from Edward Gibbon onward have debated the relative weight of these causes. What distinguishes Christianity is arguably the combination: an exclusive monotheism that demanded conversion (unlike the additive polytheism of the day), a strong communal life that cared for its members, a universal message that crossed ethnic boundaries, and a conviction — grounded in the resurrection — worth dying for. The willingness of Christians to die rather than sacrifice to the gods was itself, paradoxically, a form of evangelism: it testified to a hope that onlookers found compelling.
The earliest Christians did not meet in purpose-built churches; they gathered in private homes (the "house church"), where they prayed, read the scriptures of Israel, heard the apostles' teaching, and shared the "breaking of bread". Paul's letters give us glimpses of this worship: the recitation of early creedal formulae (1 Corinthians 15:3–5 preserves what is widely regarded as a tradition Paul himself "received"), the singing of hymns (the Christ-hymn of Philippians 2 may be an example), and the celebration of the Lord's Supper, which Paul had to correct at Corinth where the wealthy were shaming the poor (1 Corinthians 11:17–34). Baptism marked entry into the community, and Paul interpreted it as dying and rising with Christ (Romans 6:3–4).
Ministry in the apostolic age was fluid and developing. The Twelve held a foundational, witnessing role; alongside them stood prophets, teachers and, increasingly, local officers. Acts 6 describes the appointment of seven men to serve tables, often read as an early form of the diaconate, while Paul's letters mention "overseers" (episkopoi) and "deacons" (diakonoi) at Philippi (Philippians 1:1). By the time of Ignatius of Antioch, in the early second century, a threefold pattern of a single bishop, a council of presbyters (elders) and deacons was emerging — though scholars debate how quickly and uniformly this developed. The point for candidates is that church order was not fixed from the outset but grew, under pressure of practical need and the death of the apostolic generation.
Key term: Episkopos — Greek for "overseer", the word from which "bishop" derives. In the New Testament it is used interchangeably with presbyteros ("elder"); the distinct office of a single presiding bishop emerged in the decades that followed.
A central interpretive question in this topic is the relationship between the new movement and the Judaism from which it sprang. On the one hand there was profound continuity: the first Christians were Jews, they used the Jewish scriptures, they worshipped in the Temple, and they understood Jesus as the fulfilment of God's promises to Israel. On the other hand, forces pushed toward separation. The admission of Gentiles without the Law (settled at the Council of Jerusalem) created communities whose membership no longer coincided with Israel. The destruction of the Jerusalem Temple by the Romans in AD 70 removed the institutional centre of both Jewish and Jewish-Christian worship and accelerated the parting of the ways. Over the following decades, as the Church became increasingly Gentile and as tensions sharpened, Christianity and rabbinic Judaism developed as distinct faiths.
Historians often speak of this as the "parting of the ways", and they debate how early and how decisive it was. For the A-Level student, the key insight is that early Christianity is best understood neither as simply a continuation of Judaism nor as a wholly new religion that broke cleanly from it, but as a movement that emerged within Judaism and only gradually became distinct — a process in which the Gentile mission and the events of AD 70 were decisive turning points.
The Apostolic Fathers were Christian writers of the late first and early second centuries believed to have had contact with the apostles or their immediate disciples. Their writings are invaluable evidence for the beliefs and practices of the earliest Church beyond the New Testament:
Taken together, the Apostolic Fathers reveal a Church in transition. The apostles and eyewitnesses were dying; the question of how to preserve authentic teaching and order in their absence became pressing. The answers these writers give — a growing emphasis on the authority of the bishop (Ignatius), the value of ordered ministry (Clement), the dignity of martyrdom (Polycarp), and an agreed pattern of worship and ethics (the Didache) — show the early Church consciously securing its identity for the generations to come.
A recurring theme in the study of the early Church is the relationship between the Jewish-Christian church in Jerusalem, led by James, and the predominantly Gentile churches founded by Paul. The table below sets out the contrast — though it should be read as two ends of a spectrum rather than two wholly separate religions.
| Feature | Jerusalem church (James) | Pauline Gentile churches |
|---|---|---|
| Membership | Jewish believers in Jesus as Messiah | Predominantly Gentile converts |
| Attitude to the Law | Continued Temple worship and Torah observance | Justification by faith, not works of the Law |
| Centre | Jerusalem | Antioch and cities across the empire |
| Leading figure | James, the brother of Jesus | Paul, apostle to the Gentiles |
| Lasting significance | Preserved continuity with Israel | Made Christianity a universal faith |
The Council of Jerusalem (Acts 15) is best read as the moment at which this potential division was held together: Gentiles were admitted without the Law, while Jewish believers were not required to abandon their ancestral practices.
Alongside Paul, Peter (Simon Peter) stands as the leading apostle of the Jerusalem period. The Gospels present him as the spokesman of the Twelve, and Matthew records Jesus' words, "you are Peter, and on this rock I will build my church" (Matthew 16:18) — a text that would later become central to Roman Catholic claims for the primacy of the bishop of Rome, though its interpretation is contested between traditions. In Acts, Peter preaches the Pentecost sermon, performs the first healings, and — crucially — is the apostle through whom the first major Gentile, the centurion Cornelius, is received into the Church (Acts 10), after a vision teaching him that God shows no partiality and that what God has made clean must not be called profane. Strong early tradition holds that Peter later went to Rome and was martyred there under Nero, which, together with Paul's martyrdom in the same city, gave Rome a unique double apostolic foundation.
The contrast and complementarity of Peter and Paul is itself instructive. Peter, the apostle most associated with the mission to the Jews, and Paul, the apostle to the Gentiles (a division of labour Paul himself describes in Galatians 2:7–8), together embody the two streams the early Church had to hold together. That the tradition came to honour them jointly — celebrating them on the same feast day — expresses the unity that the Council of Jerusalem had secured.
Why does the apostolic age matter so much for the later Church? First, it is the period in which the foundational events and witnesses are located: the resurrection appearances, the gift of the Spirit, and the testimony of those who had known Jesus. Later generations would appeal to this apostolic witness as the standard of authentic Christianity — the criterion of "apostolicity" that shaped the formation of the New Testament canon and the idea of apostolic succession. Second, it is the period in which the decisive question of Christian identity — Jew, Gentile, or a new humanity transcending both — was posed and provisionally answered. Third, it produced, in Paul's letters, the earliest and in many ways the most influential Christian theology, whose categories (justification, grace, the body of Christ) would be debated for two millennia. The apostolic age is, in short, the seedbed of everything that followed.
"The Council of Jerusalem was the most important event in the spread of early Christianity." Evaluate this view.
The claim has real force. Until Acts 15, the gospel's future as a universal faith was genuinely in doubt. Had James and the Jerusalem leadership sided with those demanding circumcision, Christianity might have remained a reform movement within Judaism, its appeal limited to those willing to adopt the whole Mosaic Law. By detaching membership of the people of God from circumcision and food laws, the council removed the single greatest barrier to Gentile conversion and made possible the rapid expansion that followed. On this reading, Acts 15 is the hinge on which the entire later history of the Church turns.
Yet the claim can be challenged on the ground that the council ratified, rather than initiated, a mission already under way. Paul's preaching to Gentiles, the conversion of Cornelius, and the mixed church at Antioch all preceded the council; Acts 15 settled a dispute about something that was already happening. A defender of the original view can reply that ratification was precisely what mattered: without the authority of the Jerusalem leadership, the Gentile mission would have lacked legitimacy and the Church might have fractured into rival Jewish and Gentile bodies. The council's importance lies less in originating the mission than in preventing schism and securing unity.
A stronger objection is that other factors were at least as decisive. Paul's conversion supplied the missionary genius and theological depth that drove expansion; the Pax Romana supplied the infrastructure; the resurrection faith supplied the message itself. One might argue that without Paul there would have been no Gentile mission for the council to ratify, making his conversion the more fundamental event. Against this, it can be said that Paul's labours would have produced lasting division rather than a single Church had the council ruled the other way — so the two events are complementary rather than competing.
On balance, the council was necessary but not sufficient for the spread of Christianity. It was indispensable in removing the decisive obstacle and preserving unity, and in that precise sense its claim to supreme importance is well founded; but it operated alongside Paul's mission, Roman conditions and the resurrection proclamation, none of which it could replace. The fairest judgement is that the Council of Jerusalem was the most important single decision for the universal future of the faith, while not being the sole cause of its spread.
Examiner-style commentary: This response is sustained and genuinely evaluative rather than descriptive. It sets out the strongest case for the statement, then tests it against successive objections, allowing each side a reply, which demonstrates the dialectical handling examiners reward. It deploys accurate textual support (Acts 15, the Cornelius episode, Paul's conversion) without merely narrating. The judgement is substantiated and discriminating — distinguishing "most important single decision" from "sole cause" — rather than a bare assertion tacked on at the end. A Mid-band answer would describe the council and assert its importance; a Stronger answer would weigh it against one or two other factors; this Top-band answer sustains a line of argument, lets each side reply, and reaches a qualified, substantiated judgement. To go even further, a candidate might weigh how a historian's criteria of "importance" (necessary condition vs. efficient cause) shape the verdict.
The apostolic age transformed a Jewish messianic movement into a universal faith. Pentecost gave the Church its birth and mission; the Council of Jerusalem secured Gentile inclusion without the Law; Paul's conversion and journeys carried the gospel across the empire and produced the earliest Christian theology; the proclamation of the resurrection supplied the message that drove the mission; persecution under Rome tested but ultimately strengthened the Church; and a combination of social, linguistic and religious factors enabled its spread. The Apostolic Fathers show a Church already developing its ministry, worship and sense of unity, while Peter and Paul together embody the holding-together of the Jewish and Gentile streams. The decisions and convictions of these earliest decades — about who belongs, about authority, about how the risen Christ is proclaimed — set the trajectory for everything that followed, which is why the apostolic age remains foundational for the study of Christianity.
A final word on sources is in order. Almost everything we know of the apostolic age comes from the New Testament itself — chiefly the Acts of the Apostles and Paul's letters — supplemented by the Apostolic Fathers and a few non-Christian references such as Pliny, Tacitus and Suetonius. Acts is a theological history with its own emphases, and Paul's letters are occasional writings addressed to particular situations; historians read them critically, comparing Acts with Galatians, for example, where their accounts overlap. For the A-Level student this means handling the evidence with care: the apostolic age is exceptionally well attested by the standards of ancient history, but it is known through documents written by believers for believers, and a serious treatment will be alert to their character as well as their content.
Exam tip: Distinguish carefully between the Jewish-Christian church in Jerusalem (James) and the Gentile churches of Paul, and show how the Council of Jerusalem held them together. Support points with specific references (Acts 2, Acts 9, Acts 15, 1 Corinthians 15) rather than vague generalisation, and always verify a quotation before using it — paraphrase with the reference if unsure.