I am a deeply religious person and I will tell you the vast majority of us do not act this way at all. Not even in ancient times did the majority of us act this way.
Study, early Catholic church history. They shocked the world with how kind and generous they were compared to the rest of the world. There are fanatics out there to be sure, but they are few and far between.
If I had a vision of an angel come to me and tell me to kill a person I can already tell you that both me as an individual and my church would automatically condemn such a "vision" and anyone who did as the so-called vision told them to do.
Religion is a completely different thing from a cult or superstition.