How much do you know about L. Ron Hubbard?
He lived a mile and a half from my grandfather's place when Mr. Hubbard was in his formative years. He had a, shall we say, less than stellar reputation, one that has continued well into the greedy sucking sound that is the CoS. If you truly believe that the CoS actually teaches you to think critically, I suggest you go sign up for some of their "personality tests".
Organized religion may be like organized crime - but the CoS is one of the most voracious, destructive cults generated in the past century. Sure, they're not going out like the Davidians, but the number of destroyed lives and drained bank accounts they've left in their wake probably significantly outweighs anything Koresh managed to do...