If you're a Real Housewives fan, then you know who Mary Cosby is. And if you don't, you're in for a wild ride. Cosby is one of the stars of Bravo's The Real Housewives of Salt Lake City, and while she didn't get thrown in prison like Jen Shah, she's remained a controversial cast member. This is due to persistent allegations that the church she runs, Faith Temple, is a cult. While the rumors have died down in newer seasons of RHOSLC, a bombshell documentary on HBO Max is thrusting them back into the spotlight.