People realize there is nothing "supernatural" in this, right?
Regardless of what "real world" stuff actually did or did not happen or what time period we are discussing (like being kidnapped and held prisoner etc), there is no metaphysical/paranormal/miraculous/supernatural/divine/etc things happening anywhere in this show. They can't really open portals and the movements don't really "do" anything.
Incredibly similar to her earlier movie Sound of My Voice. It's a combo of mental illness(es), deception, and/or desperate people willing to do or fall for anything.