Combine this with comic books. As previously established, the superheroes of the Golden Age were metaphors for the Jewish experience in the white Christian dominated American culture. Superman was, in many ways, the perfect metaphor for this. But as time went on, Supes gradually shifted into a Christ allegory. IIRC, there's a book called The Kryptonite Kid about a boy who is obsessed with Superman, and even favorably compares him to Jesus at one point.
The second issue of Action Comics is out, with Superman on the run and discovering his rocket ship that he landed on Earth with. It begins imparting information about his heritage and what his mission in life should be. You aren't assuming anything -- Grant Morrison and Rags Morales, in the back of the book, publicly state that the rocket is like Moses' basket from the book of Exodus.
In other words, Supes is going back to his roots as a Jewish allegory instead of a Christian one.
Well, for the most part. There are a number of similarities between Jesus and Moses. Remember, Jesus was a Jew and studied the Torah in depth. Still, this is the most blatant acknowledgement of Superman's cultural history ever.
Somewhere in the Afterlife, Siegel and Schuster are smiling.