Obviously you don’t understand the Christian religion’s conclusion regarding so-called holy writ of other religions.
The Koran is not just another book to biblical believers. But I don’t have the time to go into all that.
I do. It's very simple. A lunatic man decided that God was speaking to him, so he wrote it down, conquered Medina, then conquered Mecca. His ravings are no different than any pagan book of worship. He killed or caused to be killed millions of people including 3000 in New York in 2001.
Any difficulties so far?