The Spirit Of Islam, page-2

I think this portion pretty much sums it all:

"Mathematician Blase Pascal who lived in 1670 said, "Men never do evil so completely and cheerfully as when they do it from religious conviction." The heart of man is naturally evil. You can ignite that evil with religious gasoline. The Quran's verses ignited that evil in the hearts of those terrorists and will ignite evil in many more Muslims' hearts.

While violence committed by militant Muslims is sanctioned and commanded by the Quran, any atrocities committed by Christians were never sanctioned by the New Testament commandments. For Jesus Christ commanded His apostle Peter,

"Put your sword in its place. For all who take the sword will perish by the swords (Matthew 26:52