Alucarda is spanish and kind of arty, let's just say it has lots of bloody nuns and is freaky. It's a girl posessed in a convent and probably takes place in the 1800s. It's kind of trashy but fun.
here's some info:
http://www.imdb.com/title/tt0075666/

The Children of the Corn
The Exorcist

hmm thanks, sounds well bizarre!

Actualy, there is one satanic film that I haven't seen in a long time, and can't seem to find anywhere, that is one of my favorites. Its called Satan's Blood. I think its European. Anyway, the plot is basicly this: A newlywed couple moves into these apartments where all of these devil worshipers live. There is a couple next door to them who put some type of spell on them and it leades to all sorts of sexual orgies involving onesomes, twosomes, threesomes foursomes and maybe more-somes. LOL It has this crazy scene at the beginning of a girl being screwed and then sacrificed at the moment of climax. In other words, it makes most of the movies mentioned here look like the edited for television version of Child's Play. Anybody seen this movie or know where I could find it?

Avenger, you have redeemed yourself here. The Ninth Gate is indeed a fine film and worthy rec from the satanism subgenre.

Race with the Devil

The Omen

If no ones mentioned the devil rides out they should cause it's awesome, in fact it should be mentioned anyway, regardless of topic!

The church, rosemary's baby, witches, and the devil rides out

I haven't seen the the film version of The Devil Rides Out yet, but I'm reading the novel right now. From what I've heard the film is very different from the book. Yes no?