[RAZOR]

The Crusades? Have you read your history lately, the Muslims came very close to taking over all of Europe, they were stopped in France, they took Syria, Palestine, and Egypt by 632,and Jerusalem in 637. Greece, Bulgaria, Serbia, and Romania were not liberated till the 19th century. They spanned three continents at their height. Constantinople fell to them in 1453,effectively cutting off the trade route to the Far East, which led Columbus to seek new routes to the Spice Islands in 1492.
To say that Christians were aggressors is like saying that the American Indians were illegal aliens. In the English Channel the Muslims captured one of the Pilgrims returning ships circa 1625,filled with goods that were to be sold in England, they took Captain and crew to be sold as slaves.They were doing the same when Jefferson was President and we sent troops in to liberate the Americans taken as hostage.We need to pay attention to history theirs has been a bloody trail.
The marching orders of the Christian are found in the NT. Yes the OT is filled with war but we have a balance of tolerance within the entire teaching of the Bible which the Koran lacks.