Galations 1 verses 6-9:
6. I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:
7. Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.
8. 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.
9. As we said before, so say I now again, if any man preach any other gospel unto you than that ye have received, let him be accursed.
Islam is another gospel, a false Revelation just like Mormonism. We dont even need to look into the Quran or read anything about it, Jesus warned us of "Other Gospels" such as Islam, and God has warned us before this has come to pass, people who dont see this warning ... Are BLIND.