Peter Holmes wrote: ↑Wed Apr 22, 2020 6:34 am
The factual assertion 'incest is contrary to God's will and purpose for human beings' is true or false - and what people believe makes no difference.
But the hypothetical assertion 'if incest is contrary to God's will and purpose for human beings, then incest is morally wrong' doesn't follow, even if the antecedent is true. It assumes that acting contrary to God's will and purpose for human beings is morally wrong - and that's a matter of judgement.
Actually, it could only "not follow" if God were not, in fact, the
Creator of the very things being judged, and the
Empowerer of the judgment used rightly to assess them. But He is both. As such, only He can say what a given thing was created
for, or created to
be, and only His judgments can be perfectly correct in identifying what those things are. That's what makes a things morally right or wrong in the first place: they were constituted as such in His act of purposive creation.
I think maybe you're still thinking
ex-post-facto, as if the Creation happened all by itself, and then God had to appear after-the-fact and assess which parts of it are good and evil. That is not the postulate. The postulate is that the very (right) concepts of good and evil are, in fact, derivative of what He has done, and what his judgment tells us about the things He's done when He created them.
The assertion 'incest is morally wrong' is not factual, because it has no truth-value independent from what people believe.
It is factual, because the created nature of sexuality means that the Creator alone can rightly tell us what its original function is. And it will not matter one whit what "people" believe, since nothing they believe actually changes reality or reconstitutes creation itself. Their opinions can be right, or they can be wrong; but they are right or wrong to the extent that they reflect or fail to reflect the original purpose for which things were created.