Unfortunately, I know from whence you speak; I have had exposure to this behaviour and it's painful to watch.

This person is using this church and their version of God as a crutch. This is never good. God and his people hold you up when you need it, but also make you stand when it is time to bloom on your own. It should never be about blame of others, isolation, and blind following. Until this person realizes their own soul is lost, they will not see daylight, and there's not a lot anyone can do. I'm sorry.

Stay there in the wings and look for signs of daylight. Hopefully they'll come sooner than later. Good luck and God's blessing.