‘Oh, God!’

A cleverly calculated fantasy, inventive and sophisticated and, in view of its cosmic material, zestfully unpretentious. As this 1977 movie’s clever ads were the first to say, God, in the guise of a peppery oldster played by George Burns, materializes among us and singles out a mild-mannered assistant produce manager, played with an engaging and easy assurance by John Denver (pictured with Teri Garr), to bring his updated message to the world (Disney, Sunday, 10 p.m.).