It copies stories from the Bible. Remember Islam didn't start intill the 700's AD. It twists these scriptural stories and adds to them. Example: The story of Noah is different, the story of Abraham going up to scrafice his son has his son's switched.
The Bibles writings on these subjects are older than those of the Quran, these earlier writings have the edge of being less corrrupted...from the arcaeological view point.
If the Bible is wrong, the Quran is wrong. (Since it copies from the Bible)
However, if the Bible is correct, the Quran is still wrong. (Since its copies of the bibles stories are twisted and missing key parts)
Within the Qurn it states Jesus did not die. This means there could be no ressurection. This means no sacrifice for sins and no Savior.
Christians believe Jesus is God, therefore, since Muslims do not believe Jesus is God, Christians and Muslims do not worship the same God.