Written and directed by Larry Cohen (Bone, It's Alive, Black Caesar, The Stuff), 1976s God Told Me To (aka Demon) is a thought provoking horror/science fiction hybrid.
Tony Lo Bianco stars as a NYPD detective who tries to figure out the motives behind a series of seemingly random bursts of deadly violence which are connected by all of the perpetrators stating the reason for their transgression was that "god told them to." Eventually he traces everything back to a cult like organization headed by the always intriguing Richard Lynch. Things get darker and more complicated from there, ultimately leading to an explosive climax.
Keep an eye out for Andy Kaufman's first film appearance as a NYPD patrolman who becomes motivated to commit violence during a parade detail.