I think the sun is up there, but there's also something to be said for worshipping the Earth or the air, as well as the ocean and/or the moon if you live on a coast or island or something. The cool thing about those four is that none of them reliably cause cancer like the sun does unless you go digging for radioactive elements or whatever.

The Sun is probably what most resembles the Abrahamic God (complete with not being able to look at its face), but I think the other options more resemble other religious ethea, plus the moon sometimes eclipses the sun, which means it's way less scary to worship the moon (lunar eclipses are whatever).