They, of course, have all kinds of very clever ways of explaining that away. One of the trickiest being their whole shpiel about how the old covenant and the new covenant bes just one and the same "everlasting" covenant ... you seem pretty sharp Victor. Moriah would love to see you thoroughly debunk that particular chestnut.

That and the whole nonsense about sanctification being an endless behavioral modification program for the flesh (they don't use those words but that bes the essence of the teaching).
Sounds like you've been through the mill with these folks yourself. Yes, I'm sure that you've also see the means of taking the ministration of death (as 2 Corinthians 3:7 calls it) and then placing it in a pretty box with fancy wrapping paper, and passing it off as "new". Uh, the contents are the same, and calling it "new" doesn't make the first covenant "new". It still carries a death penalty, just as Romans 3:19 would like to remind everyone.
A careful reading of Jeremiah 31:32 or Hebrews 8:9 will show that the new covenant
isn't according to the one made at Sinai, and the following verses show that it causes the recipients to know God with no further need for instruction. There isn't any law that can accomplish that, and so I believe this is an allusion of His indwelling Spirit of adoption.
Frankly, the texts aren't specific about the law that is written into our hearts and minds.
However, they
are specific about what the law written into us
isn't, and it isn't the first covenant mediated by Moses, the ten commandments (Deuteronomy 4:13).
It doesn't take smarts to figure this out, and I'm not sharper than anyone else.
What I am is patient, and I desire to submit myself to what the Bible actually teaches, rather than force it to line up with "distinctives".
I enjoyed reading your comments - thanks for the warm welcome. I only have a few minutes that I was able to pop in, but wanted to add some thoughts while I had the chance.
Victor