I don't have time to do anything other than point to this important post by Scott Klusendorf called BECKWITH ON NATURAL LAW AND BIBLICAL EXEGESIS.
Francis Beckwith and Scott Klusendorf are two of my heroes. I pay close attention to what they say. When they comment on natural law, I pay very close attention.
The debate about natural law is important. Many in reformed circles reject the concept of natural law as unbiblical citing verses which support antithesis.
This is a complex topic but the implications are enormous. Where you fall on this debate will in fact dictate how you view apologetics, evangelism, and engaging culture. Yeah, kinda important. And definitely a point of tension within the PCA. More thots later...