Scientology. LRon Hubbard freely admitted that he would invent a fake religion in order to get rich. How can?
(i wonder how much he must have been laughing at his congregation, probably even more than we laugh at tom cruise for being such a devoted alien worshipper, or whatever)
of course all religions were fabricated by man for wealth, power, and/or control, but some at least made a believable effort (for the time). This one just blows me away, and really goes to show how people can be made to believe anything if they really want to