The abusive and secretive practices of the RCC, the Anglican Church, the Salvation Army and Jehovah's Witness in Australia count as abusive and secretive, no doubt.
I don't believe the mainstream churches deserve any special consideration ahead of scientology. The Royal Commission into institutional abuse in Australia has demonstrated that with stark clarity.
Just as citizens of scientology and other religious creeds may be nice people, the reality is the organisations are all as rotten as each other. Some just pretend it's only because of bad apples instead of in the dna of the organisation.