Being the theatre nerd mentioned above, I thought I'd mention one fairly cool example of theatre qua religion. Among the Yoruba people of Nigeria, a very interesting ritual is that of the ngungun. Special priests wear masks and engage in a dance wherein they become, for all intents and purposes, various dead ancestors and interact with members of the community in dance and song and celebration. It's an amazing interplay of life and death. Within the same group, there are many similar rituals wherein they "become" animals.
What's amazing to me is that these religious expressions have continued in societies that have embraced other mainstream religions like Christianity or Islam, the believers seeing no contradiction between them. That leads to the idea of religious spill-over and cross-breeding but I'll let my good buddy talk more about that if he so chooses. -leeman