Do Christians and Muslims believe in one God?

Question 60016.

Whenever this question comes up, people are usually asking two different things at once, and it helps to separate them before deciding whether Christians and Muslims worship the same God. One question is whether both faiths teach that there is only one God. The other is whether the God each describes is in fact the same God. The first has a straightforward answer. The second does not, and confusing them is how most of the heat in this argument gets generated.

I have had this conversation with Muslim neighbours, with students, and with Christians who find the whole subject uncomfortable. It deserves a careful answer rather than a slogan, because a careless yes wounds the truth and a careless no wounds the person in front of you.

Where the agreement is real

Islam and Christianity are both uncompromisingly monotheistic. Both deny that there are many gods. Both teach that God is one, eternal, uncreated, all knowing and all powerful, the Maker of everything that exists, personal enough to speak and to command, and the Judge before whom every human being will stand. Both traditions trace their story back through Abraham. Neither will tolerate an idol. That is genuine common ground, and I see no value in pretending otherwise.

There is also a shared moral vocabulary. Muslims speak seriously about prayer, fasting, charity, purity and submission to God, and many practise those things with a discipline that ought to shame a good deal of Western Christianity. When a Muslim friend tells me that God is great, I do not hear that as nonsense. I hear a statement I believe to be true, said by someone who means it.

Why using the word God does not settle whether we mean the same God

Here is where the real work begins. The word God is not a name badge that identifies a Person on its own. It is a description, and descriptions can be filled in different ways. Two people can both use the word and mean genuinely different beings, in the same way that two people can both speak of the Prime Minister while one has 1979 in mind and the other has today. Agreement on the word is not yet agreement on the same God.

The test is not the label. The test is the identity behind it. Who is this God? What has He done? What has He said about Himself? And on those questions Islam and Christianity do not give slightly different answers with a shared core. They give answers that cannot both be true at once.

The point where the roads separate

Christianity confesses that the one God eternally exists as Father, Son and Holy Spirit. That is not an optional extra or a later philosophical accretion; it is the shape of the Christian confession from the beginning. The Qur’an explicitly rejects it, denying that God has a son and treating any association of partners with God as the gravest of sins. So the Christian says that the one God has an eternal Son who became flesh, and Islam says that to say so is blasphemy. This is not a nuance. Both cannot be describing the same God.

The division deepens at the cross. Islam denies that Jesus died there at all, teaching instead that it only appeared so. Christianity stands or falls on the opposite claim, that Christ died for our sins in accordance with the Scriptures and was raised on the third day. Remove that and there is no gospel left to preach. So the two faiths disagree not only about who God is in Himself but about what He has actually done in history.

There is a difference of character as well. Scripture says that God is love in His very being, and that this love was expressed between Father and Son before the world existed. In Islamic teaching, where God is a solitary unity, love cannot be eternal and internal in that way; it becomes something God shows once there is a creation to show it to. Whether the God being described is the same God is not a question about tone. It is a question about what sort of being He is.

How the New Testament handles a case like this

Paul in Athens is often quoted as though he simply endorsed pagan devotion. Read the speech and you find something more interesting. He takes their altar to an unknown god as a starting point and then tells them plainly that what they worship as unknown he now proclaims to them, before calling them to repent because a day of judgement is fixed and a man has been raised from the dead. He grants the sincerity and corrects the content.

Jesus is more direct still. He tells opponents who were devout monotheists that if they knew Him they would know His Father also, and that whoever has seen Him has seen the Father. John writes that no one who denies the Son has the Father. On the New Testament’s own terms, you cannot get to the true God around Jesus. That is why I cannot say that a religion which denies the Son nevertheless arrives at the same God by another route.

So what should we say to a Muslim friend?

Not that they worship a false idol of their own invention. I do not believe that is accurate or kind. A Muslim is genuinely reaching toward the Creator of heaven and earth, using much language I share, and refusing every idol on the way. What I do believe is that the God he is reaching for has revealed Himself more fully than he has yet been told, and that the revelation is a Person, not a further book.

So the useful conversation is rarely about whether we mean the same God in the abstract. It is about Jesus. Who do you say that He is? What do you make of the crucifixion, which every serious historian outside Islam accepts as fact? What would it change if God had come near enough to be touched? I have written more on whether Islam is compatible with Christianity and on what Islam actually teaches, and both of those keep landing at the same place.

Why the answer matters pastorally

If we say too quickly that both faiths reach the same God, we have quietly said that the incarnation was decorative and the cross unnecessary. That is not generosity; it is the removal of the only news we have to give. Mission becomes cultural tourism. There is nothing to invite anyone to.

If we say it too harshly, we make the Muslim into a caricature, and we lose the conversation before it starts. I would rather say what is true in both directions. There is much you and I agree on. There is one thing we do not, and it is the thing everything else hangs on, and I cannot keep it to myself because I love you. That sentence has opened more doors for me than any argument about whether we technically pray to the same God.

Truth and courtesy together

British life gives us a great many chances to be neighbourly across this divide, and I want Christians to be the best neighbours in the street. Hospitality, honesty, an interest in someone’s family and their homeland, a refusal to repeat lazy nonsense about Islam that we have not checked. None of that requires me to pretend our disagreement is small.

Discernment is not hostility. I can honour a man’s sincerity, defend his freedom to worship, share a meal in his home, and still tell him that Jesus is Lord, because that is precisely what I would want a Muslim to do for me if he believed I was missing something eternal. Where truth and courtesy are set against each other, someone has usually stopped loving one of them.

So, now what?

If you came here wanting a single word, the honest answer is that Christians and Muslims aim at the one Creator God, and describe Him so differently at the decisive points that we are not in fact worshipping the same God. The difference is not a detail of theology. It is a Person, and His name is Jesus.

So what do you do with that? Learn enough to speak with confidence rather than nervousness. Get to know a Muslim properly rather than an idea of one. Pray for the courage to say the one thing that will cost you something in the conversation. And keep your eyes on the fact that the God you are commending is not a doctrine to be won but a Father who sent His Son a very long way to find people who were not looking for Him.

Who is the liar but he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son. No one who denies the Son has the Father. Whoever confesses the Son has the Father also.

1 John 2:22 to 23 (ESV)