Some of the earliest known religions were heliocentric—they felt both blessed and indebted to the big fireball in the sky. And unbeknownst to their primitive minds, they weren’t too far from the truth. The big sky-fire had indeed ignited into life and released all the materials that created virtually everything in our solar system—including them.
Religion has only digressed with layer upon layer of bull over time. Common sense has diminished in this respect.
EDIT: I may have misused the word heliocentric, I only meant it as the sun being the focus or center of primitive belief, not a belief the sun was actually in the center.
I always thought this would make a great universal atheist logo. Recognizable for its basic elements in the same way a cross is.