Scientology is obvisouly a pyramid scheme, and for that it should be denounced.
But I don't think that the tenets and beliefs of Scientology are any more absurd than those of any religion. Mine included.
A crappy science fiction writer claiming (or is that "clamming") that an alien dumped nasty spirits into the mountains of Hawaii 78 billion years ago, only to be spit back out and attaching themselves to every human being, isn't a bit more absurd than any other belief system? What about the fact that this is "high-level", copyrighted "truths" one can't learn until thousands of dollars have been "donated" for previous levels of BullShip...
Never mind how they get people to reveal their deepest, darkest secrets and then use those secrets to blackmail them.
This is one insidious cult that should be destroyed. Check out www.xenu.net.