Nah. Plenty of Hindus and Buddhists do it too. The problem isnt a specific religion or religions, people who want to hurt others are attracted to positions of authority. Religion offers the best cover.
That depends on what role religion plays in a society. In a non religious society, those people are drawn to other positions of authority where they can perpetrate. For instance teachers and social workers are among the worst when it comes to occupations where these people end up.