About law-keeping and Paul. I strongly recommend Ellen White's take on this. The following quote is taken from the Act of the Apostles. Here Ellen White explicitly teach that the brethren in Jerusalem was mistaken in regard to the ceremonial law. It's somewhat long, but it is quite illuminating, so please take the time to consider the following:
* * *
«Throughout his ministry, Paul had looked to God for direct guidance. At the same time, he had been very careful to labor in harmony with the decisions of the general council at Jerusalem, and as a result the churches were “established in the faith, and increased in number daily.” Acts 16:5. And now, notwithstanding the lack of sympathy shown him by some, he found comfort in the consciousness that he had done his duty in encouraging in his converts a spirit of loyalty, generosity, and brotherly love, as revealed on this occasion in the liberal contributions which he was enabled to place before the Jewish elders. {AA 402.2}
After the presentation of the gifts, Paul “declared particularly what things God had wrought among the Gentiles by his ministry.” This recital of facts brought to the hearts of all, even of those who had been doubting, the conviction that the blessing of heaven had accompanied his labors. “When they heard it, they glorified the Lord.” They felt that the methods of labor pursued by the apostle bore the signet of Heaven. The liberal contributions lying before them added weight to the testimony of the apostle concerning the faithfulness of the new churches established among the Gentiles. The men who, while numbered among those who were in charge of the work at Jerusalem, had urged that arbitrary measures of control be adopted, saw Paul’s ministry in a new light and were convinced that their own course had been wrong, that they had been held in bondage by Jewish customs and traditions, and that the work of the gospel had been greatly hindered by their failure to recognize that the wall of partition between Jew and Gentile had been broken down by the death of Christ. {AA 402.3}
This was the golden opportunity for all the leading brethren to confess frankly that God had wrought through Paul, and that at times they had erred in permitting the reports of his enemies to arouse their jealousy and prejudice. But instead of uniting in an effort to do justice to the one who had been injured, they gave him counsel which showed that they still cherished a feeling that Paul should be held largely responsible for the existing prejudice. They did not stand nobly in his defense, endeavoring to show the disaffected ones where they were wrong, but sought to effect a compromise by counseling him to pursue a course which in their opinion would remove all cause for misapprehension. {AA 403.1}
“Thou seest, brother,” they said, in response to his testimony, “how many thousands of Jews there are which believe; and they are all zealous of the law: and they are informed of thee, that thou teachest all the Jews which are among the Gentiles to forsake Moses, saying that they ought not to circumcise their children, neither to walk after the customs. What is it therefore? the multitude must needs come together: for they will hear that thou art come. Do therefore this that we say to thee: We have four men which have a vow on them; them take, and purify thyself with them, and be at charges with them, that they may shave their heads: and all may know that those things, whereof they were informed concerning thee, are nothing; but that thou thyself also walkest orderly, and keepest the law. As touching the Gentiles which believe, we have written and concluded that they observe no such thing, save only that they keep themselves from things offered to idols, and from blood, and from strangled, and from fornication.” {AA 403.2}
The brethren hoped that Paul, by following the course suggested, might give a decisive contradiction to the false reports concerning him. They assured him that the decision of the former council concerning the Gentile converts and the ceremonial law, still held good. But the advice now given was not consistent with that decision. The Spirit of God did not prompt this instruction; it was the fruit of cowardice. The leaders of the church in Jerusalem knew that by non-conformity to the ceremonial law, Christians would bring upon themselves the hatred of the Jews and expose themselves to persecution. The Sanhedrin was doing its utmost to hinder the progress of the gospel. Men were chosen by this body to follow up the apostles, especially Paul, and in every possible way to oppose their work. Should the believers in Christ be condemned before the Sanhedrin as breakers of the law, they would suffer swift and severe punishment as apostates from the Jewish faith. {AA 404.1}
Many of the Jews who had accepted the gospel still cherished a regard for the ceremonial law and were only too willing to make unwise concessions, hoping thus to gain the confidence of their countrymen, to remove their prejudice, and to win them to faith in Christ as the world’s Redeemer. Paul realized that so long as many of the leading members of the church at Jerusalem should continue to cherish prejudice against him, they would work constantly to counteract his influence. He felt that if by any reasonable concession he could win them to the truth he would remove a great obstacle to the success of the gospel in other places. But he was not authorized of God to concede as much as they asked. {AA 405.1}
When we think of Paul’s great desire to be in harmony with his brethren, his tenderness toward the weak in the faith, his reverence for the apostles who had been with Christ, and for James, the brother of the Lord, and his purpose to become all things to all men so far as he could without sacrificing principle—when we think of all this, it is less surprising that he was constrained to deviate from the firm, decided course that he had hitherto followed. But instead of accomplishing the desired object, his efforts for conciliation only precipitated the crisis, hastened his predicted sufferings, and resulted in separating him from his brethren, depriving the church of one of its strongest pillars, and bringing sorrow to Christian hearts in every land.»