It is very interesting to see what the history of the "church" is and how it has grown over the years.
I took courses with a professor of English in Florida who claims he was at a poker game with L. Ron Hubbard when Hubbard made the bet that he could start a religion and people would follow him. Man, he wasn't kidding.
It is insane to see how people get into these types of organizations and stay in them despite all the things they see that are so wrong and destructive. This documentary is an excellent psychological study of how and why this happens. The insight is invaluable and heartbreaking.