1980's horror comedy - zombie menace at bible camp - musical?

I can't remember the title! It was a slasher film that was basically a spoof of the Friday 13th films. I know it was "...of the dead"...something...the plot was that a preacher was in town and incites the people to send all teens to bible camp because of their sinning ways. All the stereotypes are packed off to scripture camp...where they are picked off one by one and turned into zombies. It includes musical numbers (the campers singing good morning) and talking decapitated heads. What's the title of this b-movie gem?