Main difference with Christianity:
We believe Jesus is a Prophet and the Messiah, but he is not the son of God. Adam, Noah, Abraham, Moses are Prophets in addition to Mohamed being the last one.
We believe there is only one God, we do not believe in the concept of Trinity. Consider that God took a human form is blasphemous in Islam.
We do not believe God is a kind of human in the clouds. He is an entity which has created the Universe, has no beginning and no end, is unique, has no sons or parents, has full power on the whole Universe, and has full-knowing of everything that happens in this Universe. We don't represent God because the brain can not imagine a physical representation of Him.
We don't believe in Jesus to be sacrificed to save mankind and its sins. Everybody is responsible for its own acts and pays for its own sins.
Every human is born free of sins instead of Christians believing that we are all sinners since day 1.
If you have any question, please go ahead!