Oh this one is easy. Buddhism. The one religion I've found that doesn't irritatingly try to convert you, and killing someone over not being Buddhist would be anathema to the very tenets they subscribe to, so you're not going to see them having crusades or jihads. It's a religion that focuses on self improvement, rather than forcing others to improve according to how they see things, (ala Christianity and Islam) which is admirable. I don't believe in the spirits and such that they do, but I commend them for being courteous enough to keep said spirits to themselves.
However, if I had to pick a God to worship I'll go with Sylune, Goddess of love from Forgotten Realms. At least her clergy are actively encouraged to have sex with as many devoted followers as they want.