Oh, God! is a hilarious film which benefits from the brilliant teaming of George Burns, as the Almighty in human form, and John Denver, sensational in his screen debut as a supermarket assistant manager who finds himself a suburban Moses.
A light inoffensive satire that brings God back to earth as crusty, caring George Burns to tell mankind to stop mucking up the river-fouling the air, killing each other off, preaching exclusive paths to heaven and to get back to the business of loving. [14 Oct 1977, p.11]
The gags are slighted in favor of John Denver-style homilies, mouthed by John Denver, while the film collapses under the weight of missed narrative connections, the apparent victim of excessive recutting.
Reiner does one of his best directing jobs and never resorts to some of the silliness he's demonstrated in other films. Denver is very affable and could have had a good movie career given the right material.