No I would never want to join such a religious organization.

But I did drink ayahuasca with a shaman once. It was interesting. I did it more out of curiosity then anything else. I see the value in the ritual it creates a very good set and setting and a shaman is a great guide who can help one integrate an experience. I might not agree with their explanation to whats going on. But that's fine and may be difficult to discuss due to language issues and cultural backround anyway.