It is open for debate by any right thinking person.
"All this time, the founding fathers' premise/belief that our inalienable rights were endowed by our Creator were mythological in origin?
Did they specify which creator?
"It could have been, or might have been, Zeus who gave us these rights?
Perhaps it was other humans that gave those rights?
"Why doesn't our money state "IN ZEUS WE TRUST"?
Because America is not ancient Greece. Btw, the founding fathers did not put that on money.
Anyone who looks to the text of Federal Reserve notes to bolster his faith is in deep spiritual trouble.
There are four words on all US coins; "In God We Trust" are not they.