[majormajor]

> It's also really the only thing that makes sense from an individual rights perspective, given the absence of God.

If someone's going to disagree with someone else on the existence of God, then surely they can disagree with them on the existence of rights (in general or in specifics). And so the concept of rights outside of society consensus is back to being no more use than the concept of God. (That is: it's high use if everyone agrees, but there's nothing forcing everyone to agree, so it all comes down to social negotiation.)