You've obviously never read the Qur'an. There are pages and pages of material condoning and inciting people to violence. Sam Harris printed pages of quotes from a translation of the Qur'an in The End of Faith, it was an eye-opening read for me. I often hear liberals repeating that it's not really a violent text, without knowing anything about it, they just want to believe it, maybe because it fits with the liberal philosophy of tolerance. The old testament also has some of that, but I think Islam easily wins as the most violent mainstream religion, both in reality and in their holy texts.