We all know what the religious values are. They belong to culture. As Hume said, "ought" does not proceed from "is."
We are born utterly selfish and relentlessly self centered. Have you ever been around two year olds?
A system of binding moral awareness does not just pop into our minds at random.
They are taught to and inculcated in us largely by parents and society. Our parents got them from our grandparents, who got them from our great grandparents, etc. etc.
Our moral awareness is history within us, and to some significant extent that awareness has been passed directly or indirectly by the Muslim, Hindu, Confucian, Buddhist, or Judeo-Christian system of ethics our culture was steeped in, depending on the geography of where we were born.