I've been getting some traffic from an older post on Andy Bartlett's blog Known World, Old World: Fantasy Religion? I think it's just coincidence and people are just going to that post, then clicking blog links in Andy's sidebar. But it's a worthwhile read: How do you keep the excitement of real-world religion, with its schisms, heresies, corrupt priests (or false priests,) and religious conflicts? Andy's partial solution is... well, I'll let you read it on your own.
This is certainly a topic I've talked about before, but may like to return to.