>>And specifically, what “natural law” might that be?
The law that says that when cultures “normalize” behavior that reduces their socio-biological fitness, they FAIL to compete with more reproductively fit cultures.
Simple.
I, for one, will refuse to give up the biblical worldview just because a fool doesn’t recognize its authority.
What the anti-theists refer to as “natural law” is simply the way the Creator made things and how He tells us is best to live in the reality He created.
And, rather than just guess, I will look to the special revelation He has given us.