Elind
Philosopher
I'm no christian, but there are a couple of relevant facts:
The RCC - considered by some to be progressive, has a huge number of ordained exorcists.
The Episcopalian/Anglican Church, easily the most progressive christian church, has exorcists and conducts exorcisms, so I think the answer is that all churches believe in demons as much as they do the sky-daddy.
Definitely not treated as allegory.
Same thinking that Donald Trump understands about his flock.
