What is a Muslim?

Christianity has no single magisterial teaching about what a Muslim is, but the tradition does have deep and varied resources for thinking about people who worship God outside the church. The most important theological question Christians ask about Muslims is not primarily a sociological one but a spiritual one: how does a devout monotheist who reveres Jesus as a prophet, honours Abraham, prays five times daily, and seeks to submit entirely to God relate to the God Christians know through Christ? Different branches of Christianity have answered this quite differently, and those differences matter enormously if you are a Christian trying to work out how to think about your Muslim neighbour, colleague, or friend.

Many mainstream Christian theologians, particularly in the Catholic and Anglican traditions, have pointed to the shared Abrahamic heritage as theologically significant. The Second Vatican Council's document Nostra Aetate, issued in 1965, marked a turning point by explicitly stating that the church looks upon Muslims with esteem, acknowledging that they worship the one living God, merciful and mighty, and trace their faith through Abraham. This was not a declaration that Islam and Christianity are the same, but it was a formal recognition that Muslims are not simply pagans or idolaters. For ordinary Catholics and many Anglicans, this framing has shaped how they approach Muslim friends: not as strangers to God, but as people oriented towards the same divine source, even if the Christian believes something essential is missing without the person of Christ.

Protestant traditions have been more varied, and in some cases more cautious. Reformed and evangelical theologians have often stressed that the God of the Bible and the God of the Qur'an, though they share a name and some attributes, are understood so differently that speaking of a common faith can be misleading. For these thinkers, what defines a Muslim, in Christian terms, is someone who has not yet received the revelation of God as Trinity, Father, Son, and Holy Spirit, and who does not recognise Jesus as Lord and Saviour. This is not said with contempt in serious theology, but with the earnestness that comes from believing that this recognition matters eternally. If you hold this view, the question of what a Muslim is becomes inseparable from a sense of missionary urgency and genuine concern.

There is also a quieter strand of Christian reflection, found in figures like the medieval mystic Ramon Llull and more recently in scholars who work in Christian-Muslim dialogue, that has been struck by how seriously Muslims take God. The Islamic practice of salat, praying five times a day in submission to the divine will, has moved some Christians to something like admiration, even as they would want to speak about the grace they find in Christ as something Islam does not fully account for. From this angle, a Muslim is understood as someone whose entire life is structured around the remembrance of God, and a Christian encountering that cannot simply dismiss it as empty or misdirected.

For a Christian wrestling personally with this question, perhaps because a family member has converted to Islam, or because you work closely with Muslim colleagues, or because you simply want to be honest rather than evasive, the tradition offers neither a neat answer nor a dismissive one. What it consistently offers is a call to genuine relationship, honest difference, and the kind of respect that comes from taking another person's faith seriously on its own terms. Christianity asks its followers to love their neighbours, and that love does not require pretending that all faiths are identical. It asks for the harder thing: to see a Muslim as a person of genuine devotion, to be curious about what that devotion means to them, and to hold your own convictions with both conviction and humility.