Most movies about Christ (including KING OF KINGS) depict the life of a great and good man who is unfortunately put to death. I think most fail to explain the purpose of Christ's suffering. PASSION OF THE CHRIST also succeeds in this as well.
In its defense, KOK does clearly show Jesus physically resurrected at the end. Clearly it takes more than being just a good man to accomplish that feat. I’ll need to watch “The Robe” again. Haven’t seen it in years. I do remember and love the scene where the beautiful Jean Simmons tells off Caligula and bravely marches to her death.
“Jesus of Nazareth” is probably the best film about Jesus I’ve seen though its length makes it definitely one for more than one afternoon.