Yup. These same people find these rights somehow engraved in their minds (from education in the civic religion and other socialization) and consider them to be eternal and obvious truths, which were nevertheless somehow not apparent to anyone for approximately two million years of human history, which is full of people murdering, raping, and enslaving without the slightest consideration that it might be violating people's rights.

I don't mean to pick on them, but just to strengthen your point: almost all of us believe in something supernatural (which doesn't make it any more real, of course.) But what really characterizes people who believe in something supernatural is they believe that thing is natural. Devout Christians do, of course, believe that God transcends nature, having created it, but God is for them an entirely 'natural' thing, a perfectly obvious and eternal truth that everybody should just know, you'd think, an inalienable part of the natural world.

This kind of fundamental belief, or axiom, or cognitive bias, or whatever you want to call it, is very difficult for most people to really identify and understand in themselves.