Don't Deliver Us From Evil (1971) review

Two teenage girls at the St. Mary's boarding school, Anne (Jeanne Goupil) and Lore (Catherine Wagener), form a strong bond with not only each other but Lucifer himself, so when they return home and are able to spend a few months together, they get into all sorts of trouble: they set fires, taunt a farmer, drink alcohol and then seduce a fellow whose automobile has run out of gas before murdering him after he tries to rape Lore.  This is very loosely based on a real-life crime in New Zealand where Juliet Hulme and Pauline Parker teamed up to kill Pauline's mother, but unlike Peter Jackson's version of the story, this is entirely focused on being a teensploitation movie and taking the easy route of mocking religion: Séria lingers over his leads in their underthings (for the record, both actresses were of legal age), they spit out the Eucharist, there's a Black Mass, a man carrying a crucifix is whipped, etc.  Despite trying for "shock value" - there's even some disgusting animal torture - the majority of it drones on, although I do appreciate that the incessantly giggling youngsters are fans of Lautréamont.  See, I told you kids needed to read more.