It really is the self-evident object of worship. Even from simple observations in the real world, without science, everyone knows the dominant importance of the sun. You just can't get any more impressive than that!
and science has only made it more impressive, frankly. it's a ball of gas so large it's beyond out ability to understand. it's millions and millions of miles away yet holds us in an iron grip of orbit. it's painful to look at even when blocked. it visibly burns and leaves permanent marks on you just by being in it. those burns kill you from the inside out if you get too many. one day it'll grow so massive it'll consume the earth entirely. yet if it suddenly disappeared, literally all life would die very quickly.
meanwhile, the moon has gotten way less god-like as we've learned more about it. what, it moves some water around? it slows our days? boooo. get some new material, moon! you're not even your own thing, you're just some of earth's debris that made an orb!