Scientology has Xenu the space-devil, and the alien ghosts that implant themselves in everyone's bodies...
However, I still think their tax-exempt religious status should be revoked. It was originally rejected for legitimate legal reasons and was only conceded to them because of bullying (via lawsuit-DDoS).
Worryingly, I've noticed more mainstream religions are copying some of Scientology's business methods. "Prosperity gospel" basically copies the way they make massive real-estate investments and buy lavish luxuries for top officials using donations from followers. Some Christian boarding schools basically operate like Sea Org on land. I don't think the time is far off when tax exempt status for all religions will have to be revoked to clamp down on these abuses. Scientology has let the genie out of the bottle.