I once had a young lady condemn me on Facebook for saying that all religions are one of the biggest starters of war and deaths of different races. She said that her christian religion did not do that. I reminded her about all the things done in "christ name." The wiping out of entire races in the new world, the inquisition, the witch hunts, the crusades, etc..
While wars have been started for a lot reasons, religion is the leading cause. Next comes power, wealth, greed. Oh wait that describes religion.