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>> “It is most telling that in all the epistles to congregations there is not a single word commanding Gentiles to adopt the whole Torah” <<
That is absolute nonsense!
Just start with Matthew 5 which declares Torah to be forever.
Then Matthew 7:21-23, which sends the lawless to eternal darkness.
Then Acts 15 that calls on every new believer to hear Moses read in their synagogue every Sabbath day.
Romans 2:13 declares only doers of the law will be justified.
The entire epistle to the Colossians praises them for keeping the appointed times, and tells them to let no man judge them in their keeping of Torah but the Kehillah.
All the epistles speak of the keeping of the feasts, and Paul tells several congregations to withhold their tithes and gifts until the close of the Sabbath, and bring them in after sundown when the Sabbath has closed and the first day of the week has begun. (traveling with money is forbidden on the Sabbath)
The whole NT is about how to keep Torah.
Perhaps you should do your Bible reading when you are more awake.
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The standard they wanted to keep was the Law. Paul was telling them that they could be justified before God by keeping it. So, keep the Law. Keep all of it, but if you dont, youre in trouble. It is the doers of the Law who are justified before God. He tells them that the Gentiles who didn't have the Law according to the knowledge of the Jews were instinctively keeping the Law (v. 14) and will be judged accordingly. How much more the Jews?
Paul was showing the self-righteous Jews who judged the Gentiles that they were not able to keep a perfect standard. They were hypocrites. This is why Paul tells us in the very next chapter, in Romans 3:28, that we are justified by faith apart from the works of the Law--which includes the Law of loving God (Deut. 6:5), and loving your neighbor (Lev. 19:18). No one is able to keep the Law. If you fail even once, then you become guilty of it all.
James 2:10, For whoever keeps the whole law and yet stumbles in one point, he has become guilty of all. Gal. 3:10, For as many as are of the works of the Law are under a curse; for it is written, Cursed is everyone who does not abide by all things written in the book of the law, to perform them.
The Jews (and anyone else) can be justified before God by keeping the Law, but he or she has to be perfect. A person cant fail even once--ever. But since all fail, that is why we have the gospel that tells us Jesus kept the Law perfectly (1 Pet. 2:22), and that we can be justified before God by faith in Him (Romans 4:3, 5; 5:1; John 1:12; 3:16).