Who's "they"? GBN? They're from the Church of Christ, which has nothing to do with the group Yates was involved in.
So you encountered one religious organization that you thought was disreputable, and now you want to paint all religious organizations with the same brush? There's a word for that: bigotry.
BTW, if you're wanting to throw darts at a religious organization because of Andrea Yates, try the Catholic Church. She was raised Roman Catholic; her "mentor", Micheal Woroniecki, was raised Polish Catholic. Hmmmmm. Sounds fishy to me. But, both renounced their Catholicism, and Woroniecki went as far as to call all religious organizations evil, so your link between GBN and Yates is a non-sequitur.