Called Jor-El a liar. Sure, you're sending your son here to show us the way - has nothing to do with the fact that your planet is about to blow up.
Yup - there are quite a number of us out there who think that Jor-El (at least the movie one) was a real piece of work. The LnC one wasn't much better - he sent his kid off to Earth, but apparently with the expectation that he was going to grow up and be blindly obedient to the Kryptonian cause?
As for adding religious views to fictional characters - like any other attribute, it can add to the character's background, filling in blanks, giving so insight into how the person was raised, how they view the world. Adding religious background, or even religious thoughts to a character doesn't mean you have to get metaphysical or have a deity as an active character.
