The Unholy (1988)
Dir. Camilo Vila
A blind-buy for me that turned out to be a lot of supernatural fun. It stars Ben Cross as a Priest named Michael who gets appointed to a New Orleans parish that has been closed for a few years, for reasons that are shown in the movie's opening scene but which I won't spoil.
Inside the church is an evil presence that strives to influence the newcomer, but Father Michael is determined to resist. Yes, it's another tale of Good vs Evil, Heaven vs Hell, etc, happening on Earth, naturally, because that's where that kind of shit nearly always goes down.
There's often a trade-off in 1980s supernatural movies — such as good FX but bad acting, or good direction ruined by bad editing — but The Unholy does well right across the board.