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Christianity and Islam are the world's two largest religions, together accounting for over half the global population. They share deep Abrahamic roots — a common ancestor in Abraham, a strict ethical monotheism, and a shared belief in revelation, prophets, scripture and final judgement. Yet they also hold profound theological differences, above all concerning the nature of God (Trinity versus tawhid), the identity of Jesus (Son of God versus revered human prophet), and the status of their scriptures (Bible versus Qur'an). This lesson examines the Abrahamic connections, the strikingly high Islamic estimate of Jesus alongside the points at which it sharply diverges from Christian belief, the long history of dialogue and conflict, the teaching of Nostra Aetate §3, the key theological differences, and the contemporary initiatives — above all A Common Word — that seek common ground. Throughout, the aim is to attribute each tradition's views accurately and to verify every scriptural reference, since misrepresenting another faith is itself a serious failure.
Christianity and Islam are both Abrahamic religions: they trace their spiritual ancestry to Abraham (Ibrahim in Arabic), the patriarch who, in both traditions, responded to the call of the one true God and established the pattern of faithful monotheism. Together with Judaism they form the family of Abrahamic monotheisms, sharing far more with one another than with the non-theistic or polytheistic traditions of the world.
| Belief | Christianity | Islam |
|---|---|---|
| Monotheism | One God (Trinity) | One God (tawhid — absolute oneness) |
| Creation | God created the world from nothing | God (Allah) created the world by divine command |
| Revelation | God reveals through Scripture and supremely through Christ | God reveals through the Qur'an, the final revelation |
| Prophecy | The prophets of Israel; Christ as fulfilment | A line of prophets from Adam to Muhammad (the "Seal of the Prophets") |
| Final judgement | Christ will return to judge the living and the dead | Yawm al-Qiyamah (Day of Judgement); all are judged |
| Afterlife | Heaven and hell | Jannah (paradise) and Jahannam (hell) |
| Ethics | Love of God and neighbour; the Decalogue | Submission to God's will; the Five Pillars; Shari'a |
The convergences are substantial and genuine: both worship one transcendent creator God, hold human beings morally accountable before him, expect a final judgement and resurrection, revere a line of prophets (with large overlap — Adam, Noah, Abraham, Moses and Jesus are prophets in Islam), value scripture as revelation, and command compassion, almsgiving and care for the poor. These shared convictions are not superficial; they are the basis on which serious dialogue has become possible.
In the Bible, Abraham is father of Isaac (ancestor of the Israelites) and of Ishmael (Isma'il, traditionally regarded as ancestor of the Arabs). The Qur'an honours Ibrahim as a hanif — a pure monotheist who submitted wholly to God before Judaism, Christianity or Islam existed as such — and presents him as the very model of islam (submission). The Qur'an associates Ibrahim and Isma'il with the building of the Ka'ba in Mecca as a house of worship of the one God. For Islam, then, Islam is not a new religion but the restoration of the original, pure monotheism of Abraham, which (on the Islamic view) Jews and Christians had partially corrupted — a framing that is itself significant for how the relationship is understood.
Key term: Hanif — in the Qur'an, a person of pure, primordial monotheism, devoted to the one God and turning from idolatry; Abraham (Ibrahim) is the supreme hanif, the model of islam before the named religions existed.
One of the most striking features of the relationship is the high status Islam accords to Jesus — 'Isa ibn Maryam, Jesus son of Mary. It is essential to state the Islamic view precisely, neither exaggerating the agreement with Christianity nor underplaying the genuine reverence, because careless generalisation here is a common and serious error.
The Qur'an names Jesus many times and gives him remarkable honour. It affirms his virgin birth, his role as prophet and messenger, his performance of miracles by God's permission, and applies to him titles found nowhere else in such concentration. Crucially, the Qur'an calls Jesus al-Masih — "the Messiah" — and describes him as a "Word from God" (kalima) cast to Mary and a "Spirit from Him" (ruh). Surah 4:171 gathers several of these: "The Messiah, Jesus son of Mary, was only a messenger of God, and His word that He committed to Mary, and a spirit from Him." Yet the same verse immediately sets the boundary: it continues, "do not say 'Three' … God is only one God; glory be to Him — that He should have a son."
| Qur'anic teaching about Jesus | Reference |
|---|---|
| Born of the Virgin Mary (Maryam) | Surah 3:47; 19:16–35 |
| A prophet and messenger of God | Surah 4:171; 5:75 |
| Performed miracles by God's permission | Surah 3:49; 5:110 |
| Called "the Messiah" (al-Masih) | Surah 3:45; 4:171 |
| "A Word from God" (kalima) | Surah 3:45; 4:171 |
| "A Spirit from Him" (ruh) | Surah 4:171 |
| Not crucified — "it was made to appear so to them" | Surah 4:157–158 |
| Not divine; God "has no son" | Surah 4:171; 5:72; 19:35 |
Two points require careful statement. First, the titles are striking: Islam calls Jesus "Messiah" and "Word of God," yet these carry a different meaning than in Christianity — "Messiah" functions as an honorific without the divine connotations Christians attach to it, and "Word" denotes God's creative command ("Be!") by which Jesus was conceived, not the eternal divine Logos of John 1. Second, the crucifixion: Surah 4:157 states that Jesus' opponents "did not kill him, nor crucify him, but it was made to appear so to them" (shubbiha lahum). The mainstream Islamic interpretation, following classical commentators such as al-Tabari and Ibn Kathir, is that God did not allow Jesus to be killed but raised him alive to himself; many traditions hold that another was made to resemble him and died in his place. (A minority of modern Muslim scholars read the verse differently, but the dominant view denies the crucifixion of Jesus.) This directly contradicts the Christian conviction, central to the gospel, that Christ truly died and rose.
Three further features of the Islamic Jesus deserve mention, because they show both how close and how far the two portraits stand. The Qur'an gives a higher place to Jesus' mother than the New Testament does in one respect: Mary (Maryam) is the only woman named in the Qur'an, an entire Surah (19) bears her name, and she is honoured as chosen "above the women of the worlds" (Surah 3:42) — so Muslim reverence for Mary can exceed that of some Protestant Christians. Jesus' miracles are affirmed, including healings and raising the dead, always "by God's permission" — the qualifier that protects tawhid by denying that Jesus acted by independent divine power. And many Islamic traditions expect the return of Jesus before the Day of Judgement, when he will defeat the false messiah (al-Dajjal) and establish justice — a striking convergence with Christian expectation of the second coming, though this teaching rests chiefly on hadith rather than on the Qur'an itself. The overall shape is consistent: Islam exalts Jesus as one of the very greatest prophets and messengers, born of a virgin, sinless, miracle-working and returning at the end — while firmly refusing the one claim Christianity treats as decisive, that he is God the Son. Accurately holding together this high prophetology and this denial of divinity is the key to representing the Islamic Jesus without distortion.
Key term: 'Isa — the Qur'anic name for Jesus ('Isa ibn Maryam, Jesus son of Mary). In Islam he is a sinless prophet and messenger, the Messiah, born of the Virgin Mary, a worker of miracles by God's leave, and (in the hadith) one who will return before the end — but emphatically a creature, not divine.
| Christianity | Islam |
|---|---|
| Jesus is the Son of God, second person of the Trinity, truly God and truly human | Jesus is a human prophet — among the greatest, but wholly human |
| Jesus is God incarnate, the eternal Word made flesh (John 1:14) | God does not become incarnate; to claim a divine son is shirk |
| Jesus truly died on the cross and rose from the dead | Jesus was not crucified; God raised him alive to heaven |
| God is triune — Father, Son and Holy Spirit | Tawhid — God is absolutely one; the Trinity is rejected |
Key term: Tawhid — the Islamic doctrine of the absolute oneness and indivisible unity of God. It is the cardinal principle of Islamic theology and stands directly opposed to anything Muslims judge to compromise God's unity, including the Christian Trinity.
Key term: Shirk — in Islam, the cardinal sin of associating any partner or equal with God, or ascribing divinity to a creature. Because the Trinity and the divinity of Christ appear, to Muslims, to do exactly this, they are rejected as shirk.
The Christian-Muslim relationship has run through both creative exchange and devastating conflict, and an honest account holds both together rather than selecting one.
The earliest encounters were shaped by the rapid Islamic conquests of the seventh and eighth centuries, which brought the Christian heartlands of the Middle East and North Africa, and eventually much of Spain, under Muslim rule. Christians (and Jews) living under Islamic governance were classed as dhimmi — "protected people" or "People of the Book" (Ahl al-Kitab) — permitted to practise their religion and granted communal autonomy in exchange for a special tax (jizya) and acceptance of a subordinate legal status. The picture is genuinely mixed and should not be flattened in either direction: by the standards of the age this dhimma arrangement often afforded real toleration, and periods such as the convivencia of medieval Spain saw notable coexistence; yet dhimmis were second-class subjects, and toleration could give way to pressure or persecution.
Key term: People of the Book (Ahl al-Kitab) — the Islamic designation for communities, principally Jews and Christians, who received earlier divine scriptures. They are accorded a recognised, protected status in Islamic law, distinct from that of polytheists.
The Crusades are the most violent chapter. Launched by Pope Urban II in 1095, they were military campaigns to seize the Holy Land from Muslim control. The capture of Jerusalem in 1099, accompanied by the massacre of Muslim and Jewish inhabitants, remains a potent symbol of religious violence, and the memory of the Crusades still colours Muslim perceptions of the Christian West. They are a standing reminder that the two missionary monotheisms have repeatedly met as armed rivals, not only as theological interlocutors. A balanced account, however, resists turning this into a simple morality tale: the Crusades were in part a response to the earlier loss of Christian lands to Islamic conquest, both civilisations fought expansionist wars in the name of faith, and figures such as Saladin (Salah al-Din), who recaptured Jerusalem in 1187, were remembered even by Christian sources for chivalry and restraint. The history is one of mutual religious warfare and mutual atrocity, and also of long stretches of pragmatic coexistence — which is why neither triumphalism nor one-sided guilt does it justice.
Alongside the conflict ran a remarkable intellectual exchange. Muslim scholars preserved, translated and developed Greek philosophy and science — above all Aristotle — that had largely been lost to the Latin West. The commentaries of Ibn Rushd (Averroes, 1126–1198) profoundly shaped Christian scholasticism: Thomas Aquinas engages Averroes so constantly that he simply calls him "the Commentator." The translation centres of Toledo transmitted Arabic learning (and Arabic-preserved Greek learning) into Christendom, helping to make the medieval universities and, ultimately, Aquinas's own synthesis possible. The debt is a powerful counter to any narrative of pure hostility.
A celebrated counter-example to the Crusading spirit occurred during the Fifth Crusade, when Francis of Assisi (c. 1181–1226) crossed the lines to meet Sultan al-Kamil of Egypt. The sources indicate Francis was received with courtesy and that the two spoke with mutual respect. The encounter has become a model of interfaith meeting conducted in humility and genuine curiosity rather than conquest, and is often invoked in modern Catholic-Muslim dialogue.
The twentieth century produced Christian scholars who sought a deeper, sympathetic understanding of Islam from within Christian commitment. The Anglican bishop Kenneth Cragg (1913–2012), in works such as The Call of the Minaret, urged Christians to take Islam's spiritual seriousness fully on board — to "hear the minaret" — while engaging in honest theological dialogue about the real differences, above all the meaning of the cross and the person of Christ. Cragg's approach is neither dismissive nor syncretistic: he honours Muslim devotion to God and respect for Jesus, yet maintains that the Christian conviction of God's self-giving love in the crucified Christ is precisely the "word" that Islam, as he saw it, had not received. The French scholar Louis Massignon (1883–1962), whose study of the Sufi martyr al-Hallaj reshaped Western understanding of Islamic mysticism, exemplified a Catholic engagement that found in Sufism genuine depths of love for God. These figures show that serious Christian engagement with Islam need not collapse the differences; the model is respectful honesty rather than either polemic or harmonisation.
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