Christians and Jews rightly point out that the Koran is a violent text which calls on Muslims to attack "unbelievers".
But they fail to see that the Bible is at least as violent.
NPR noted in 2010:
Religion historian Philip Jenkins decided to compare the brutality quotient of the Quran and the Bible.
"Much to my surprise, the Islamic scriptures in the Quran were actually far less bloody and less violent than those in the Bible," Jenkins says.
Jenkins is a professor at Penn State University and author of two books dealing with the issue: the recently published Jesus Wars, and Dark Passages , which has not been published but is already drawing controversy.
Violence in the Quran, he and others say, is largely a defense against attack.