I tried to join the church to check it out from the inside but I stuffed up the interview. I was asked whether Id ever been on any kind of prescription medication prescribed by a psychiatrist. Soon as I told her "yes", interview over. She told me I couldnt cross "the bridge", I was unsaveable. Scientology uses such extreme methods of mind alteration , including, among other delights - "bullbaiting" (deliberately trying to upset people as a 'test') and "group accusation" scenarios, - that people have suffered emotional breakdowns.
My understanding of the churches dislike of psychiatry is that, In the 60s the Church was 'persecuted', among other places right here in Melbourne by the state government for their methods of conversion and indoctrination. There was a huge stink. Health professionals, including psychiatrists were involved in the 'persecution', hence the church doesnt like anything to do with mental health professionalism.