How is christianity any different? Never heard of the crusades and Spanish Inquisition? A little more modern, Branch Dividians. I bet if Westboro Baptist had the member base of Islam, they'd become quite the terrorists.
You obviously have no understanding of the crusades.
The viking raids of the medieval period turned Europe into an armed to the teeth, warrior filled society. When the viking threat subsided, the roving bands of warriors were left with nothing to do. The pope hatched a plan to get rich; call on a crusade to recapture the holy land (a very worthy goal, IMO, since it was a Christian land that had been taken by force, recapture it with force) and all those who went would come to Italy, and leave from Italian ports.
Also, it isn't as if the muslim people were peaceful, from the rise of Islam until the crusades, the Muslims were burning a path of destruction and war across the middle east, anatolia, the balkins, northern africa and Iberia. The crusades were not an offensive, they were a counter-offensive.
The crusades were a response to the militant spread of islam. Not an act of Christian violence.
St. Paul converted people with his words, Muhammad and his followers converted with the sword.
As to the inquisition, very often this was typical political persecution, using religion as a guise to gain acceptance by the people for the persecution.
Your comparison is false on its face. Christianity, no where, in none of its supporting literature, says that violence should be used to further the faith. This has a few exceptions, the middle ages were a very violent time, after all. There was Charlemaign's verdict of verdun, and the northern crusades to convert the peagan peoples of northern europe. However, these people were constantly raiding the christianized areas of europe, and as a result, their conversion was a peace plan, not simply a mindless act of violence.
The main thing is the "constitution" of both faiths could not be more different. The Bible teaches the inherent value of human life, believer or not. The Quoran teaches to kill the infidel.
You will find those who prevert both faiths. To pervert Christianity is to turn it into violence, to pervert Islam is to preach peaceful Islam. It is a religion of violence, intolerance, and subjugation of women.