If Oscar considers his question answered, that's far enough for me. To put it clear, Scientology is a cult started by science fiction writer L Ron Hubbard, that he created to make himself lots and lots of money. It uses brainwashing techniques (like getting followers to stare at each other without blinking for hours) to indoctrinate people into its beliefs and devotion to Hubbard's teachings. The lower levels of Scientology can seem sensible and beneficial to new members, but at the higher levels, sufficiently indoctrinated members are taught that all human problems are caused by millions of souls called "thetans" that are stuck to their bodies. These "thetans" were deposited here millions of years ago by an evil alien overlord called "Xenu", a tyrant who put billions of people from other planets into volcanoes on earth and blew them up with nuclear bombs. If that sounds crazy, you're right, but I am not joking, and it is what Scientology teaches. He was a science fiction author, after all.