Muhammad is cursed
One verse alone proves that the Quran is false and Muhammad a false prophet.
“But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.” Galatians 1:8
Muhammad claimed that all his information came from the angel Gabriel. Most of what is stated in the Quran (which is a written record of everything Muhammad claimed he was told from Gabriel) contradicts the bible.
As we see in the verse above, that would mean Muhammad is cursed. Not that we didn’t already know this.
Incidentally, the same holds true for mormonism.