I am new to BNW and a bit boggled by religion.
If all the possible religions have been founded before I can found one, what is my strategy? Will the other civs like me more / not backstab me if we share a religion? Will any of the other civs care that we don't share a religion?
If I do manage to found a religion, how important is it to keep my country free from heresy? How much effort should one put into spreading and maintaining the faith?