Ok, but why can't such a God be a physical entity?
I don't propose that it can't. I'm an agnostic atheist, not a hard atheist. It very well could be that there is a godlike physical entity out there, but if there is one then we, as a species, are ignorant to it's actual existence imo
Every god story out there carries with it the same compelling evidence for it's existence as ghosts, vampires, or any other apparitional being that never leaves the realm of anecdotal attestation. Lacks substance, but makes for good campfire stories. Ultimately, this is what we are talking about - myths and legends that people weave to solve a paradox that they have created for themselves
nature is what it is. Everything we can see about it is self sustaining and perpetuating in a way that we can measure and observe, and what we don't know becomes illuminated in time. Adding an outside being that is secretly pulling the strings behind the scenes seems superfluous