Re: What is Superman's relationship with God(if any)?
Actually, Rao is both the name of Krypton's sun and the name of the god.
I assume that Rao was once identified with the sun, the same way some human religions identified their chief deity with our sun (I.e. Ra).
The Kryptonians presumably don't literally worship their sun. At least not by the time they mastered interstellar travel.