Oh, God! You Devil (1984)

That's funny, they both look like George Burns.

George Burns is back as God, but oops, here he is as Satan, too. A young rock star is ready to sell his soul to Satan, and Satan is all too happy to oblige. Oops! Seems the fellow was watched over by God as a baby, so now the almighty and his nemesis have to duke it out over the soul.