wikipedia has a ton on scientology, they have a wiki-project on it. Some of the editors are scientologists, many more are anti, but most seem to want to produced balanced articles (whatever that means), rather than spamming them. Nevertheless it still gets edited back and forth on a day-to-day basis.
If you want to rehearse fighting the $ci-people go to the talk pages of the more controversial articles, though I think some of it's been archived now.
My faves are
Space_opera_in_Scientology_doctrine for the nonsense and
Fair_Game for the evil.
They also have a lengthy article about a certain episode of South Park:
Trapped_in_the_Closet 
Linear Mode
