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So are you saying that all the stuff that they were saying in the episode while they had "Scientologists actually believe this stuff," is ACTUALLY what Scientologists believe? That has to be wrong. That's [censored] insane.
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Yes, its true.
Wikipedia has a very good article on it. Go down to the middle of the page and you can see the Xenu space-plane and the story that South Park told about the aliens 75 million years ago. This is the last thing you are taught (you pay them hundreds of thousands of dollars a year where they better your life and teach you things by levels in the church). Supposedly if a low level scientologist hears this they die, or so the church doctrine says.
It's sad really. Some people are actually warped into this. Seinfeld even is a former member. I suppose people like Cruise or Holmes are completely delusional as they don't read the internet but are surrounded and brainwashed by these people.