An immortal soul that reincarnates cover and over again, anywhere in existence. Aliens/gods/god that messed with humans genetics in the past and may have future use for us/may return. These are hardly things solely from Scientology. I mean these concepts/ideas/theories are pretty fucking common, just with different names. Having these as part of Scientology isn't something I'd hold against them. The rest? No idea, I barely know anything about Scientology.