Brother, we Gentiles who are turning to God, are still turning and the turn is not complete because we have a lot of Moses still to adopt free of human traditions, like the Sabbath.
See how very much our Father loves us, for he calls us his children, and that is what we are! But the people who belong to this world don’t recognize that we are God’s children because they don’t know him. Dear friends, we are already God’s children, but he has not yet shown us what we will be like when Christ appears. But we do know that we will be like him, for we will see him as he really is. And all who have this eager expectation will keep themselves pure, just as he is pure. Everyone who sins is breaking God’s law, for all sin is contrary to the law of God. And you know that Jesus came to take away our sins, and there is no sin in him. Anyone who continues to live in him will not sin. But anyone who keeps on sinning does not know him or understand who he is. (1 John 3:1-6 NLT)
Moses is to be obeyed! Paul did not want the new Gentiles who were turning to God to join Judaism through circumcision because Jesus was against how Judaism colored Moses with their human traditions.
“What sorrow awaits you teachers of religious law and you Pharisees. Hypocrites! For you shut the door of the Kingdom of Heaven in people’s faces. You won’t go in yourselves, and you don’t let others enter either. “What sorrow awaits you teachers of religious law and you Pharisees. Hypocrites! For you cross land and sea to make one convert, and then you turn that person into twice the child of hell you yourselves are! “Blind guides! What sorrow awaits you! For you say that it means nothing to swear ‘by God’s Temple,’ but that it is binding to swear ‘by the gold in the Temple.’ Blind fools! Which is more important—the gold or the Temple that makes the gold sacred? And you say that to swear ‘by the altar’ is not binding, but to swear ‘by the gifts on the altar’ is binding. How blind! For which is more important—the gift on the altar or the altar that makes the gift sacred? When you swear ‘by the altar,’ you are swearing by it and by everything on it. And when you swear ‘by the Temple,’ you are swearing by it and by God, who lives in it. And when you swear ‘by heaven,’ you are swearing by the throne of God and by God, who sits on the throne. (Matthew 23:13-22 NLT)
James is allowing God to "restore the fallen house of David", as the Gentiles who are turning to God listen to Moses every Sabbath independent of the influence of human traditions in Judaism. His allowing the separate growth of Gentiles who are turning to God as God "restores the house of David". At some point in the future, there will be a merging of the Gentiles who are turning to God and Judaism, allowing the continuation after Jesus of Judaism freed from human tradition. We Gentiles who are turning to God have a lot to adapt from Moses to fully "restore the fallen house of David".
When they had finished, James stood and said, “Brothers, listen to me. Peter has told you about the time God first visited the Gentiles to take from them a people for himself. And this conversion of Gentiles is exactly what the prophets predicted. As it is written: ‘Afterward I will return and restore the fallen house of David. I will rebuild its ruins and restore it, so that the rest of humanity might seek the LORD, including the Gentiles—all those I have called to be mine. The LORD has spoken—he who made these things known so long ago.’ “And so my judgment is that we should not make it difficult for the Gentiles who are turning to God. Instead, we should write and tell them to abstain from eating food offered to idols, from sexual immorality, from eating the meat of strangled animals, and from consuming blood. For these laws of Moses has been preached in Jewish synagogues in every city on every Sabbath for many generations.” (Acts 15:13-21 NLT fixed)
United in our hope for the soon return of Jesus, Jorge