Yes, religion has been the reason for many hideous wars and crimes. The crusades, the Norman Conquest was a type of crusade for William the Great to take the throne of England from Harold. The knights Templar were declared heretics and burned at the stake, all this done in the name of religion, I can go on and on.
However, this was mans interpretation of and rationalizing of religion for personal gain. We all carry our demons but can we control them and I think this is the goal of most religions. Religion is like a tool. You can take it and make beautiful things and improve the world, or you can hit someone in the head with it. We have always been the demons.

Best Regards,

People will forgive you for anything -but being right !