Religions are alive in the way language is, for the clergy to remain relevant they adapt and adopt whatever they can to survive. Without astronomy, telescopes and nowadays satellites Christians or Muslims would still be bound to Earth as being the whole universe. Some of them still are. Yahwe also is just a mashup of different ancient believes. Without kings, rulers and clergy to enforce them gods just shrivel and die. Sun doesn't.

In reality for earthling this is the only true god, that ball of gases.