I know only one thing, that you also pointed out: no religion thought war or insane actions as you described above however there are some dictators not happy with their sorrounding and since they know they are useless if they work alone to spread haterate amongst the society so they first accumulate some belivers and brainwash them and gradually come up with a im-moral army ready to destroy everything in the name of religion with only diff being god of their unidentified religion is the same useless people who don't want to see anyone happy.