The Muslims, in general, believe in the three books. The Torah, the Bible, and the Qur'an. They are all holy books. They are all about God. If you read a translation of the Qur'an, you will see that it's a lot of the same "stories" as are in the Bible as well. I have a copy of the Qur'an in translation (although it's not considered the Qur'an because it is in translation), and I have read parts of it.

Yes, many things are different. Jesus was considered a prophet, not the son of God. That's considered blasphemy to them. God is perfect. The rest of us, are not.