Lets Just lay it out on the table.
Christians Worship Jesus as God.
The Christian God is a Trinity.
Muslims don't worship Jesus; infact, they say Jesus is the slave of Allah.
Muslims don't believe in a truine God.
But then again The Jews have some of those beliefs.
But what makes a big separation between the God of the Bible and the God of the Quran, is that the Bible and Quran CONTRADICT each other. NOT because they dont worship and believe Jesus to be God, but the fact that the teachings of the two books CONTRADICT each other, unlike the Bible and the Torah, they work together in harmony. Does God contradict himself? ifso them maybe we do have the Same God. If not then I doubt we do.