For a moral law to be "eternal", means it is the same always, it cannot fluctuate. Context (such a shift in genetic stability) cannot change this.
That is why I said there are "Eternal Moral Laws" and "Moral Laws" that are not eternal.
Some (and not all) commands in regards to sleeping with kin is a "Temporal Moral Law" because at one time it was acceptable to sleep with kin so as to populate the entire Earth. It is a moral law now (or today) because one is putting at risk another life (a newborn) by disobeying this command.
Note: Sleeping with kin like with one's mother has always been forbidden.
I will write about this in a future post.
You said:
Plus, you never answered my question on how an increased risk for genetic disorder makes a pregnancy a sin. Do you apply this consistently to all people who have this increased risk - not just close kin?
God tells us that these are His commandments. So that is all the proof we need it is wrong if we break them. If we see bad things result of disobeying this command, such as another potentially perishing or suffering, we are breaking the 2nd command to love our neighbor (i.e. Hence, it is a moral law - See Romans 13:8-10).
You said:
Paul, and the Jews, dealt with the law as a unity. This is why we see "law" and not "laws". His response to the law is not to various parts of it, however you wish to divide it, but to the whole law. It is also in this sense the Christians are not under the law - the whole law.
This is because one is not trained to recongize the different aspects or differences within the Law. Some do not really care about God's laws or some have simply not done their homework on it. A great book you should check out is "From the Finger of God: The Biblical and Theological Basis for the Threefold Division of the Law."
From the Finger of God: The Biblical and Theological Basis for the Threefold Division of the Law: Philip S. Ross: 9781845506018: Amazon.com: Books
You said:
Trying to separate the law into cultic, moral, civil, or ceremonial categories is impossible. Many of the so-called-ceremonial laws have a moral dimension that cannot be jettisoned.
Yes, certain cermonial laws and judicial laws have a moral aspect or truth to them, but what determines or classifies a particular law is what does that law primarily teach or focus upon? What is that law's primary function? For example: Let's take the Saturday Sabbath command from the Old Testament (that is no longer binding under the New Covenant). The Sabbath Command is primarily a "Ceremonial Law" because it teaches a person to observe a "ceremony" or religious ritual observance of some kind. One worships on the 7th day and not on the 3rd day and not on the 4th day. One can say that law has a moral aspect to it because it seeks to give the human body rest from their physical labor or work. But the law is primarily focused on the ceremony and not the moral aspect of it. For it is saying to rest on a specific day and worship God on that specific day (As a picture and symbol of something else).
Most Moral Laws (and not all of them) are generally understood as being wrong by nature.
"For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves." (Romans 2:14).
Most of the world as a whole today generally accept that murder, theft, lying, rape, and child abuse are wrong. In other words, a moral law is any law of love that people would do by nature without God having to specifically tell them.
A person is not going to automatically obey the 7th Day Sabbath Command without God telling Him in His Word to do that.
You said:
How do you objectively determine which to keep and which to ditch? For example, do you think Leviticus 18:19 should be kept?
The most extreme form of punishment for this is being cut off from among the people. Death was not the form of punishment for disobeying this. But there are health risks to consider. There are potential risks of yeast, urinary, and even an HIV infections as the result of doing this. I do not see this as a sin unto death (if you are not aware of the dangers of this), but I do see it as if you love your partner, you would not want to do any harm towards them in any way over your own pleasure). So I would say that this law still applies because it is moral. It is in the best interest of loving your wife by obeyng this because there are no risks of infection for her.
You said:
Romans 7:6
But now we are released from the law, having died to that which held us captive, so that we serve in the new way of the Spirit and not in the old way of the written code.
The entire Mosaic Law comes to fulfillment in Christ, and this fulfillment means that this law is no longer a direct source of, or judge of, the conduct of God's people. Christian behavior is now guided directly by the "Law of Christ." This new "law" does not consist of legal prescriptions and ordinances, but of the teaching and example of Jesus and the apostles, the central demand of love, and the guiding influence of the indwelling Holy Spirit.
There is no denying that the Father, the Son, and the Holy Spirit guide us believers into all truth in regards to His good will and ways. There is also no denying that the New Testament is the main document for obedience to God's commands for believers today. But certain laws of the Old still hold true under the New that are not so clearly expressed in the New Testament (as I have shown previously).
You said:
This means murder is a sin, but not because it was in the Law of Moses.
This means sorcery is a sin, but not because it was in the Law of Moses.
This means idolatry is a sin, but not because it was in the Law of Moses.
But because they violate the Law of Christ.
Yes, I would agree with that.
If one breaks any laws of God today, they are breaking the commands in the New Testament and not the Old Testament. The Old Testament or Old Covenant is no more.
But I would say that the list you made above here are "Eternal Moral Laws" from the start at the beginning.
God never wanted man to do these kinds of evil things ever!
...