why don't atheists support scientology?

[Something completely different]

I think I know the OP's confusion. I think he believes Scientology is the religion of science. I mean, they have the same first five letters and all and everyone knows atheists all worship science.

Scientology -

"ology" - ancient greek for "study of"

"Scien" - from the latin - scio - knowlege.

So it is a combination of a greek and latin word meant to mean "The study of knowlege".

Maybe the OP just found out about a few Latin and ancient greek words and got overly excited about using them (what would have not happened if he had went to a European school where we still learn Latin and ancient greek)

Here is another greek word that has been in existance far longer than scientology and which has become a school of humanistic science.

"Epistomology" - "The science of Knowlege" which is the term given to the philosophical school of thought concerend with the questions surrounding the subject of knowlege:

http://en.wikipedia.org/wiki/Epistemology

I strongly suggest to OP that you may read through this.