Great comment on a thread on the Ex-Christian subreddit asking why Christians are so uptight about Mental Health treatment:

Because a mental illness is essentially an illness of the consciousness, which is what people probably mean when they talk about a soul. So in that regard, mental health is basically spiritual health and that’s supposed to be God’s job. Seeking help elsewhere is basically saying that a good God is doing his job badly. A kind of action-implied blasphemy. I’ve literally heard my aunt say “there’s no way you can actually be depressed when you have Jesus in your life”. Not knowing, of course, that it’s something I was struggling with. :/

It’s gotta be a holdover from when illnesses like epilepsy and schizophrenia were understood as demon possession. (perhaps also, ironically, as gifts of prophecy?)