You must believe that L. Ron Hubbard is All-Knowing, All-Seeing, Perfect and Always Right.
And they do. Completely.
You see, this is the very first lesson you learn in Scientology. At the start of each and every course you take, you must first understand and agree with Hubbard's Policy Letter "Keeping Scientology Working". In this policy letter, Hubbard modestly states that he has all the answers, that he is the only one who has these answers, that it is impossible for anyone to improve on his answers and that anyone who disagrees with all that is a very, very bad person, who must be stopped. I'm paraphrasing.
Once you've completely understood and agreed with that policy letter, you are allowed to continue on to the course material. Every course starts with this policy letter.
And the proof that Hubbard, or the Church of Scientology, or anyone gives that Hubbard was, is and will always be right is:
Yes, that's right, nobody has ever presented any evidence that Hubbard has these powers of always being right and knowing everything.
It is belief, in the purest sense of that word. Absolute, complete, perfect belief that "Hubbard is always right!"
This is why it is impossible to argue with a Scientologist. It goes like this:
You: The Church of Scientology has committed crimes, abuses, fraud. It lies.And there it is. How can you argue with that? That is the ultimate "proof", "Ron said it". Per that policy letter, it must be true.
Scientologist: Aha! It is proven that everyone who criticizes Scientology is guilty of horrible crimes for which they could be arrested, and they are all in the pay of a vast evil conspiracy. You are evil! I will destroy you!
You: Umm... what proof do you have of any of that?
Scientologist: Ron said it!
To get even more weird, not only do Scientologists believe that, if Ron said it, it is true, they also believe that if Ron did not say something, it isn't true! So you get things like the Freewinds asbestos disaster. Some people are reporting that the Scientologists in charge said that since Ron never mentioned the danger of asbestos, it couldn't be harmful!
You see, Scientologists cannot do research or think about something and make up their own minds about it, they can only check with All-Knowing-Ron. If he said something, then, by golly, that's it, it's true. And outside of that, everything else is false! No thinking, no investigation, no logic, just read what Ron said and then stop. Stop investigating, stop looking, stop thinking, stop.
The really hard-core Scientologists have gotten so good at doing this that they believe they are thinking and investigating. They very carefully "think like Ron" and then "investigate" what Ron said, and then "do what Ron would do". It is very creepy.
If you're a Scientologist, then whatever Ron said must be true or you will get ... "retrained" until you can make it true for yourself. You must go through whatever convoluted, rube-goldberg, twisted type of logic to make it work out to be true. It's a skill you must develop as a Scientologist, to only see how Ron is right and be blind to anything that might show he was wrong.
Ron promised OT super powers but never, ever exhibited any such powers himself. Nor has any other Scientologist.
Ron claimed he was better at administration and organizing than any other person in the whole world, but Scientologists have to pretend, real hard, to believe the disasters he created around the world are "successful, well run organizations".
Ron spoke of a vast evil conspiracy, composed of "International Bankers", drug companies and the always-evil psychiatrists, but he never presented any evidence of its existence. He even claimed to have completely uncovered the whole evil organization, but never presented any facts at all. To this day, no one outside of Ron has ever seen any hint of such a conspiracy. But they believe.
These, and a million other claims, are accepted whole, without ever any proof, by all Scientologists. All because of that first Policy Letter on their first course. The primary belief that they learned then: Ron is always right and anyone who disagrees is not only wrong but very, very evil.