So many metaphors of "light vs darkness", "warmth" as feeling good. We die without it. We get food from it, most power from it, orient time around it. It's my header image for a reason. Praise the sun!
If you wanted to worship something big, powerful, ancient, and nurturing, hard to see a better option than the Sun. So its actually a bit odd to see people ever worship anything else. Is it the Sun's constancy what they hold against it?