Do Christians and Muslims Worship the Same God?

A Divisive Question

Few questions about other religions stir more debate among Christians than this one. Some say that the God of Islam is simply not the God of the Bible. Others say that Christians and Muslims worship the same God, only under different names. The question has practical consequences for how Christians think about their Muslim neighbours, colleagues and fellow citizens.

The Catholic Church’s answer is careful, and it is worth understanding precisely.

What the Church Says

The Second Vatican Council addressed this directly. In its Dogmatic Constitution on the Church, it said that the plan of salvation includes the Muslims, “who, professing to hold the faith of Abraham, along with us adore the one and merciful God, who on the last day will judge mankind” (Lumen Gentium 16; CCC 841).

In Nostra Aetate (1965), the Council added: “The Church regards with esteem also the Muslims. They adore the one God, living and subsisting in Himself; merciful and all-powerful, the Creator of heaven and earth, who has spoken to men” (Nostra Aetate 3).

So the Church’s answer is that Christians and Muslims are directing their worship to the one God, the Creator. There is only one God, and Muslims are trying to worship Him.

The Word “Allah”

Part of the confusion comes from the word “Allah.” Many people assume it is the name of a separate Muslim deity. In fact, “Allah” is simply the Arabic word for “God.” Arabic-speaking Christians, who have existed since before Islam began, have always called God “Allah,” and still do in their Bibles and liturgies.

Same God, Different Understanding

But saying that Christians and Muslims worship the same God does not mean that they believe the same things about Him. They differ profoundly.

A helpful comparison is with Judaism. Jews do not accept that God is a Trinity, or that Jesus is the Son of God. Yet Christians do not say that Jews worship a different God. Jesus Himself prayed to the God of Abraham, Isaac and Jacob. Jews and Christians worship the same God, but Christians believe they know Him more fully through His self-revelation in Christ.

In a similar way, Muslims seek to worship the one God of Abraham, but with a different, and in Christian eyes incomplete, understanding of Him. Two people may both be speaking of the same person while holding very different beliefs about him. The question “do they refer to the same God?” and “do they believe the same things about God?” are different questions.

There is real common ground:

belief in one God, Creator of heaven and earth, all-powerful and merciful;
a final Day of Judgement, resurrection and life after death;
the importance of prayer, fasting and almsgiving;
respect for Abraham and the prophets;
deep honour for Jesus, whom the Qur’an calls a prophet, the Messiah and the Word of God, born of a virgin;
great reverence for Mary, the only woman named in the Qur’an, which devotes a whole chapter (Surah 19) to her.

Nostra Aetate noted all of these, adding that Muslims “value the moral life and worship God especially through prayer, almsgiving and fasting.”

Where They Profoundly Differ

The differences go to the heart of Christian faith.

The Trinity. Islam strongly rejects the Trinity, which it sees as compromising the oneness of God. The Qur’an says: “Say not ‘Three’” (4:171). Christians believe that God is one, but that His one divine nature is shared by three Persons: Father, Son and Holy Spirit.

Jesus as God. Islam teaches that Jesus was a great prophet, but only a man. To call Him the Son of God is, in Islamic belief, a grave error. For Christians, His divinity is the centre of the faith.

The Crucifixion. The Qur’an states that Jesus was not crucified, but that it was only made to appear so (4:157). Christians believe His death and Resurrection are the means of our salvation.

Revelation. Muslims believe that the Qur’an is God’s final and complete revelation, given to Muhammad, the last prophet. Christians believe that God’s revelation was completed in Jesus Christ, the Word made flesh.

Salvation. Christianity teaches that we are saved by God’s grace through Christ. Islam teaches submission to God’s will and the keeping of His law, with hope in His mercy.

These are not minor differences. They concern who God is and how we come to Him. A Catholic cannot say that Islam and Christianity are equally true.

The Christian Hope

Christians believe that the fullest revelation of God is in Jesus Christ. In Him we learn not only that God is one, merciful and just, but that He is love: Father, Son and Spirit, a communion of persons, who became man and died for us.

This is the Gospel that Christians hope to share with everyone, including Muslims. Not by coercion, but by witness, friendship and honest conversation.

How Should Catholics Relate to Muslims?

The Church asks Catholics to approach Muslims with respect and friendship. Nostra Aetate acknowledged the “quarrels and hostilities” of history and urged that “all forget the past and strive sincerely for mutual understanding.”

Popes have met with Muslim leaders many times. In 2019, Pope Francis and the Grand Imam of Al-Azhar, Ahmed el-Tayeb, signed the Document on Human Fraternity in Abu Dhabi, calling for peace, religious freedom and the rejection of violence in God’s name.

At the same time, the Church continues to defend religious freedom, including the freedom of Christians in Muslim-majority countries, many of whom face discrimination or persecution.

Respect and honesty go together. Christians can recognise their Muslim neighbours as fellow worshippers of the one God, while lovingly bearing witness to the One they believe reveals Him most fully: Jesus Christ.