In the end, special novice exorcism christian guy steps in to save the mother of the story who has been possessed by bad pagan witch woman's evil satanic spirit.
Also, novice exorcism christian guy has his psychic wife as his sidekick to provide intel from the spirit realm.
It's kind of a shit, christian religious themed movie with the usual patriarchal bullshit, as far as I'm concerned.
But it is set in the 1970s for some nice GenX nostalgia. So, there's that.