You can't hypnotise someone who won't allow it.
The reason Cruise gets away with being a Scientologist AND having Aspergers is that while his routines are so so obvious, his training as an actor allow him to disguise it. It wouldn't be that hard to fool that lot, given that alot of other cults have been fooled by far lesser examples.
Stan's example in that South Park ep proves the point. He registered high on their meter, because they were fucked to begin with. Then he let them believe he was their new 'messiah'. Then when he got sick of playing them, he told them what a bunch of shite it was. They threatened to sue him, and he said 'yeah, go ahead!'
See, the really funny thing is that those wankers have deified a science fiction writer who wasn't all that great to begin with. Shit, Arthur C Clarke and Terry Pratchett would have more credibility as writers than Hubbard.
And look at where the spiritual home of Scientology is..... fucking Hollywood. Doesn't that tell you something?