If you’re looking for more religion-based horror, you might try the 1987 film Angel Heart.  As I’m discovering quite a bit lately, I could’ve used this one in Holy Horror as well.  The religious elements are pretty hard to miss, beginning with the protagonist’s name, Harold Angel.  (Hark the, any one?)  A private detective, Angel is hired to find a missing person for a Louis Cyphre.  His search takes him from New York (where a guy keeps a pistol in a Bible (there’s maybe an entire book in this trope), down to New Orleans.  First he meets Cyphre in the back room of a black church but soon he starts getting chased out when he starts to uncover any clues.  Time to head to the Big Easy.

In New Orleans he finds all kinds of occult practices taking place.  And the folks are none-too-friendly when he starts making mention of the guy he’s after.  He ends up witnessing a voodoo ritual and complains about the bad religion he encounters.  The big reveal indicates that there’s been a case of mistaken identity.  Louis Cyphre (Lucifer) has actually been setting an elaborate trap all along.  The portrayal of the Devil as a sophisticated gentleman isn’t new, of course.  There is a scene where Angel and the Devil are in a church and Angel, being a detective, uses inappropriate language.  Lucifer (not yet revealed as such) has to remind him a couple of times to watch his tongue while in a sacred place.  Satan is more pious than Angel.

The movie has multiple issues, but it has become a cult film over the years.  Like many others that I’ve discussed on this blog, the entire plot draws its horror from religion.  Angel has a difficult time with the non-Christian worship he witnesses.  But really, it is the Christian Devil that’s the antagonist here.  Quite often in movies like this, fear of other religions is based on the supposition that Christianity is correct.  That’s been a broad American trait for centuries, and it gives horror room to run.  The idea of a generic Christianity (which is probably what most Christians hold to) overlooks the doctrinal differences, often quite significant, between denominations.  This particular avenue isn’t much pursued in horror films, at least in my experience.  Interestingly, like Cat People (1982), it places this religion-based horror in New Orleans.  There’s plenty to explore in that connection as well.  Angel Heart is not a great movie, but it can lead in some interesting directions; a holy sequel may be necessary.