In addition to narrating the film, Cash also co-wrote it with Larry Murray. Jesus was played by director Robert Elfstrom who played "the real Jesus as he might have been according to the Christianity Today of 1973. The film cuts between location footage of Jerusalem, re-enacted scenes from Jesus's life, often intercut with shots of today's polluted environement. Kinnard and Davies ("Divine Images") consider that this "technique was weakened by constant repetition throughout the film".
At the time Variety called it "an admirable musical documentary filmed in Israel, about the public life of Jesus Christ." Richard Corliss, in a Time article called "Jesus Christ Movie Star", says:
As Cash intones the words, "This is My beloved Son, in Whom I am well pleased," it's easy to imagine that God just must have a Southern accent. The pauper-budgeted simplicity and naivete of "Gospel Road" — its irrefutable good intentions — overwhelm the weirdness of a movie in which the director (blue-eyed, blond-haired Robert Elfstrom) plays Jesus and the star's wife is Mary Magdalene.There's also a few interesting comments at The Magdalene Review, which discusses this film alongside Jesus Christ Superstar whihc was also 1973 (as was Godspell). Given that my birthday is coming up soon, I think I might have to add this to my birthday list.