Leftists, who are basically relativist existentialist atheists (although some claim they believe in God but note in reality they tend to belong to liberal denominations which pay no attention to Scripture), are perfectly willing to believe that rights come from the State.
Bottom line: no God, no rights -- just revokable privileges that happen to be called rights.
So in circumstances where there is neither a God nor a state, there will be no rights, whether recognized or unrecognized?
I know several libertarians and objectivists who are of the atheist persuasion who would not only disagree with you but would prove their point in debate.
You'll just have to take my word for it. Most are banned.
Rights do not need a supernatural author or “giver” to be natural and inalienable. They can be so by the nature of the thing (person) that has the right - as was stated, rights are among equals, swatting a fly does not violate a right because the fly is not an equal, but giving one person special treatment over another DOES violate the right of equality...of course that means those with the “rights” must agree on that equality, which, if you look back 100 years in the US, you did not have that agreement...Rights, in practice, must be claimed, exercised, and defended, or they become meaningless.