No, Tod makes a good point. Speculation: What if it is hardwired into human psychology to believe in a transcendent reality....to construct a
mythology. It seems to me people generally....gravitate (no pun intended...OK maybe

) towards myth making about reality. Without even realizing it, plenty of proclaimed atheist do that with ethics. They are humanists arguing for Rights as if those Rights are some kind of universal imperative. You and I both agree (I think we do) there is no such thing as universal right within materialism. But of the debates I've had with atheists over the years, you are in the minority.
Secular humanism - Wikipedia, the free encyclopedia
"Humanism is compatible with atheism[25] and agnosticism,[26] but being atheist or agnostic does not, itself, make one a Humanist. Nevertheless, humanism is diametrically opposed to state atheism.[27][28] According to Paul Kurtz, considered by some to be the founder of the American secular humanist movement,[29] one of the differences between Marxist-Leninist atheists and humanists is the latter's commitment to "human freedom and democracy" while stating that the militant atheism of the Soviet Union
consistently violated basic human rights.[30] Kurtz also stated that the "defense of religious liberty is as precious to the humanist as are the rights of the believers".[30] Greg M. Epstein states that, "modern, organized Humanism began, in the minds of its founders, as
nothing more nor less than a religion without a God".[31]"
So Kurtz was from an American culture proclaiming that another culture violated basic human rights. Without his saying so, that's him rejecting moral (cultural) relativism.
But that is exactly what secular humanism is, a religion without a god. Call it the newest mythology. In a materialistic word, one that excludes faith and transcendence, what is the scientific conclusion for "basic human rights?" If I'm understanding you correctly we both realize there ain't one. In the Jewish/Christian tradition god is a transcendent moral
being. He transcends the natural world. Basic universal human rights are by necessity transcendent moral
qualities. They transcend the observable natural world (dualism as opposed to materialism's monism). All science (sociology/anthropology) can do with ethics is make an observation about cultural values; it can't say those moral values are better or superior to any other culture's moral code. So here's the point: an atheist who argues for such Rights and then derides a theist for his/her belief in a god, because science can't explain the truth of that deity, is being inconsistent. Both this atheist and the theist believe in a transcendent nature. They just differ on the particulars.
North Korea is state sponsored atheism but mythology its population engages in is "Dear Leader" worship.
NORTH KOREA 'Dear Leader' worship as the one religion - Asia News