The Church - 1989

"The Church is considered as the official second sequel to the Demons series. Although it was originally intended to be the third film in the series, the story has no direct thematic link with the first two parts, and therefore the 1991 horror film Dèmoni 3 (also known as Black Demons) is usually -and incorrectly- associated as the third film of the saga." - Wikipedia

Also known as Demons 3: The Church.

Thematically similar to Demons 5: The Devil's Veil, which came out the same year as The Church here, I am closing the gap as far as Demons films goes, I only have Black Demons from 1991 remaining.  Please refer to the entire breakdown as shown here.

The Church was directed by the Argento collaborator Michele Saovi.  It's clear his alliance and association with Dario Argento is still ongoing at this point in the series.  Asia Argento is cast in this as a young girl thrown into the mix of demonic goings-on.  She's a good actress, and her character is pretty cool in the story I will say.  

The Church begins with knights killing an entire population of a small village because the priest says they're demons.  Then they build a church over the grave to keep the land holy.  Then we fast forward to modern day and the church is there, in disrepair, falling apart and full of mysterious catacombs and ancient texts.  Evan comes to the church to document the old texts, and Lisa is an artist working on the church walls.  They quickly form an attraction despite the leering old Bishop.  Meanwhile, a work crew in the basement upsets the balance of the old building, and demonic forces get unleashed.

It's a semi clusterfuck movie which solidly reminded me of Demons 5.  In that one there were random characters doing things, story lines that never came back up, and nonlinear chaotic feeling to the film.  This one is a bit more linear, but it sort of loses it towards the last 30 minutes.  Evan and Lisa disappear, Asia Argento's father character goes crazy and kills himself and gets raised from the dead, then promptly disappears, some random people split up and are never heard from again, etc.  It's typically overdone, and half the people we never see what happens with them, except at the very end.

It's got a fantastic score by Philip Glass, and I also read the Keith Emerson of Emerson Lake and Palmer was on the soundtrack, but IMDb does not show that.  The music, the effects, and the demon stuff is all incredibly solid.  It's remarkable and a standout in the Demons unofficial sequels, definitely the best since Demons 2.  Also very well shot, great lighting and great atmosphere in this one:

The acting and the script is also quite good.  It felt like it could've been longer, maybe some of the storylines were cut short?  Anyways, the biggest gripe would be the storylines that appear and are never addressed again.  Besides that, it's a genuine 4 star demon action film I'd recommend.