Necromancy (1972) Bert I. Gordon directs Orson Welles (WTF) as coven grand master looking to resurrect his dead son. Welles probably got paid in wine. TIL: Before his conversion, Bl. Bartholomew Longo spent years in "depression, nervousness, and confusion" as a satanic priest.
And finally, yet another religious defense of The Exorcist? Sure, but it's a good one. 'The Exorcist is a Catholic Movie of Demonic Possession - Catholic Stand'