Below are a few verses from the Qur'an:
"Abraham, when he said to his people, “Worship God, and fear Him. That is better for you, if you only knew. You worship idols besides God, and you fabricate falsehoods. Those you worship, instead of God, cannot provide you with livelihood. So seek your livelihood from God, and worship Him, and thank Him. To Him you will be returned.” (Qur'an 29:16-17)
“We believe in God; and in what was revealed to us; and in what was revealed to Abraham, and Ishmael, and Isaac, and Jacob, and the Patriarchs; and in what was given to Moses and Jesus; and in what was given to the prophets—from their Lord. We make no distinction between any of them, and to Him we surrender.” (Qur'an 2:136)
"...there is no god but He, the Living, the Eternal. He sent down to you the Book with the Truth, confirming what came before it; and He sent down the Torah and the Gospel." (Qur'an 3:2-3)
"All food was permissible to the Children of Israel, except what Israel forbade for himself before the Torah was revealed. Say, “Bring the Torah, and read it, if you are truthful.” Whoever forges lies about God after that—these are the unjust. Say, “God has spoken the truth, so follow the religion of Abraham..." (Qur'an 3:93-95)
“Follow the religion of Abraham, the Monotheist. He was not an idol-worshiper.” (Qur'an 16:123)
"We will worship thy God, the God of our forefathers Abraham and Ishmael and Isaac, the One God; and unto Him will we surrender ourselves." (Qur'an 2:133)
As we we know, Abraham worshiped the one true God, so what other god could the verses above be describing?
Muslims may reject the deity of Christ, but that in no way changes who the one true God is, hence, Jews, Christians, and Muslims are all worshiping the same God. The God of Abraham... Muslims just have a different understanding of who God is and how salvation is found through Christ based on the teachings of Muhammad and the Qur'an. Muslims reject the Trinity as a result of these teachings, but this doesn't mean that a Muslim can't or isn't worshiping God the Father."