Founded by the prophet L. Ron Hubbard, a lesser know author and dabbler in the occult, the Church of Scientology borders on the edge of religion, self help group, and cult depending on who you ask. The traditional religions of the world look down on the group because of their lack of deities. Though most would admit that their ability to raise funds are second to none.
For the sake of D&D, clerics and paladins draw their power from their Thetans, rather than a god or deity. Most of their beliefs are secret, only being revealed to those that become worthy through rigorous self auditing.