Actually, Hubbard, Heinlein, Sturgeon and a couple others back in the before time, you know, before computers and internet, had a club of Sci-Fi authors that worked on thinking about things for the Navy. Anyways, they got a bet going on who could make up the worst religion and have people pick it up. I think someone else won the bet, but Hubberd won the game of life and greed.
Heinlein jokingly came up with the idea... Hubbard followed through with it. He got some help from Van Vogt, reputedly.