Well, I had this idea when I was looking up weird religions. The book is called "Religion inc: Exploiting Miracles for Profit". It's a satirical comedy and it revolves around a businessman who's life is going to hell as his business is declining, and his wife took half of his money during their divorce. He encounters an old friend of his who has turned into a conman, who tells him that people are often willing to blindly throw their money at any religious group. They then start their own church\religion and somehow get enough followers to become a very powerful organization. The problem is, I don't know how someone starts their own religion or church, or how someone gets followers for said religion.