I happen to have read the Koran, although I do not believe in any religion.
In addition to being one of the most tedious and unreadable books ever written, it contains literally hundreds of verses calling for war, promising horrid punishments to those who refuse to believe, etc. The Skeptic’s Annotated Koran actually lists almost 500 examples of cruelty and violence in this book. See here for the citationsAnnotated Koran.
There is not an ounce of logic or attempt at reasonable persuasion. The basic gist of the whole Koran is that you must believe what Mohammed tells you about Allah because Allah will roast your ass if you don’t.
The most miraculous thing about the Koran is that it manages to be both incredibly violent and incredibly repititious and boring. At least the Bible has some interesting stories like Noah’s Ark and such. The Koran is like Mohammed yelling at you for about 10 hours straight, demanding that you follow his religion or else.
I could go all evening transcribing verse after verse to prove my point, but here are a few taken from the Skeptic’s Annotated Koran:
Don’t bother to warn the disbelievers. Allah has blinded them. Theirs will be an awful doom. 2:6
Allah has sickened their hearts. A painful doom is theirs because they lie. 2:10
A fire has been prepared for the disbelievers, whose fuel is men and stones. 2:24
Disbelievers will be burned with fire. 2:39, 90
“Whosoever hath done evil and his sin surroundeth him; such are rightful owners of the Fire.” 2:81
If you believe in only part of the Scripture, you will suffer in this life and go to hell in the next. 2:85
Jews are the greediest of all humankind. They’d like to live 1000 years. But they are going to hell. 2:96
For disbelievers is a painful doom. 2:104
For unbelievers: ignominy in this world, an awful doom in the next. 2:114