The Christian God, the Jewish God, and the Muslim God are all the same, its just that the religions have a different take on his "prophets", and differences on things about God. For example, Christians believe that the prophets in the Old Testiment are really prophets of God, yet neither Jews or Muslims believe Jesus is the Son of God. However, Muslims do acknowledge (to my knowledge) that Jesus was a prophet of God. The take on Jesus is just one of many areas where the three religions vary. But when you get back down it, they all believe in the God of Abraham.