Public schools may not be perfect but they're much better than telling your child that humans were farted into existence by your God of choice with no other reason other than to just worship him.
But the notion that we were farted into existence through random chance for no purpose or reason at all is scary.
I know you're probably speaking in jest, but to them, it is scary.
To me? The universe itself is something I actually consider to be above the gods. It's telling that I don't believe in any of the creation stories in spite of my polytheism.
The fact that we were just "farted" into existence, the fact that our world is one where life came to be, the fact that we have accomplished the things we have accomplished... the fact that life has come this far at all...
It's beautiful and awe-inspiring to me. The universe itself is divine, and we're a part of that.
To quote Delenn from Babylon 5, "We are star stuff."