Christians and Muslims do not worship the same God. There are similarities in their views of God, but there are also distinct differences.
As you can see in the chart below, each affirms that there’s only one God and that he is eternal, knows all things, is omnipresent, and omnipotent. However, Christianity is radically different from Islam in its affirmation of the doctrine of the Trinity where God consists of three distinct and simultaneous persons: the Father, the Son, and the Holy Spirit. Islam denies this and accuses Christians of teaching polytheism.
Quran, 5:73 (Yusuf Ali), “They do blaspheme who say: Allah is one of three in a Trinity: for there is no god except One Allah. If they desist not from their word (of blasphemy), verily a grievous penalty will befall the blasphemers among them.”
As you can see, Islam denies that God is a Trinity. Also, in Christianity Jesus is the second person of the Trinity, who is in flesh. But Islam denies this as well.
Quran, 5:17, “In blasphemy indeed are those that say that Allah is Christ the son of Mary. Say: “Who then hath the least power against Allah, if His will were to destroy Christ the son of Mary, his mother, and all every – one that is on the earth? For to Allah belongeth the dominion of the heavens and the earth, and all that is between. He createth what He pleaseth. For Allah hath power over all things.”
Quran 5:75, “Christ the son of Mary was no more than a messenger; many were the messengers that passed away before him. His mother was a woman of truth. They had both to eat their (daily) food. See how Allah doth make His signs clear to them; yet see in what ways they are deluded away from the truth!”
Therefore, we conclude that Christianity and Islam do not believe in the same God.
| CHRISTIANITY | ISLAM | |
| God: Only one in all existence | Affirm | Affirm |
| God: Eternal, no beginning or end | Affirm | Affirm |
| God: Transcendent | Affirm | Affirm |
| God: Omniscient, Omnipresent, Omnipotent | Affirm | Affirm |
| God: Trinity of three Persons (Father, Son, Holy Spirit) | Affirm | Deny |
| God: Incarnation of Jesus (2nd Person of Trinity) | Affirm | Deny |
