it's not even about religion per se, it's about tribalism. attach yourself to a club and you want that club to grow and dominate. when the going gets tough, the club lash out against non-members. look at the situation in burma with the buddhists carrying out genocide against the various muslim sects. if any religion was peaceful it'd be buddism, but tribalistic cunts gang together to blame outsiders in any context.
insecure bawbags. but religion's main role in this isn't that they teach nasty shit, it's that they (any kind pretty much) create that dangerous insecurity in people from an early age because confident, free-thinking people wouldn't waste their time with imaginary friends.