Because so much of religions lies in the RP, a "good" religion is one that gives people something that they can get their RP teeth into. It's hard to get excited about promoting an empty faith. Our BM faiths need the same things that real world faiths have (albeit on a smaller scale!)
1) Stories (particularly origin stories, tales of gods and heroes)
2) Rules and Rituals (dietary restrictions, body modifications, ways to pray, how to dress, who to hate)
3) Holidays and Celebrations
4) Philosophy (Why are we here? Where are we going? How do we get there?)
5) Prophecy (The end of days! The Chosen One!)
