Jaws of Satan

Jaws of Satan, also called by its working title King Cobra, is a 1982 American horror film directed by Bob Claver, and starring Fritz Weaver, Gretchen Corbett, Jon Korkes, and Christina Applegate, in her feature film debut. Its plot follows a preacher from a cursed family who is forced to battle Satan, who has taken the form of a huge king cobra and is also influencing other regular snakes in the area.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.