Nihilo, interesting that you brought up that passage there in Galatians 2..
There is an irony here...
What the Apostle Paul is addressing there is the issue he mentions came up via Peter and company, in their dissimulation, or hypocrisy.
How that Peter and company had basically pulled a version of what Trump and company, have tried to pull.
Peter and company there had tried to force a ban on mixing with Gentiles for religious reasons.
Paul was basically reminding them that they had been proven no better off religiously by the Law of Moses, then the Gentiles and their pagan ways, that Peter and company were being hypocrites towards.
Just goes to show how timely the Scripture remains, some two thousand years later, other than in the hands of the ever extremist, and so called, religious right...
More like TOO OFTEN religious WRONG.
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For those so inclined, the following is basically the context of Galations 2.
Acts 15:1 And certain men which came down from Judaea taught the brethren, and said, Except ye be circumcised after the manner of Moses, ye cannot be saved. 15:2 When therefore Paul and Barnabas had no small dissension and disputation with them, they determined that Paul and Barnabas, and certain other of them, should go up to Jerusalem unto the apostles and elders about this question. 15:3 And being brought on their way by the church, they passed through Phenice and Samaria, declaring the conversion of the Gentiles: and they caused great joy unto all the brethren. 15:4 And when they were come to Jerusalem, they were received of the church, and of the apostles and elders, and they declared all things that God had done with them. 15:5 But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses. 15:6 And the apostles and elders came together for to consider of this matter. 15:7 And when there had been much disputing, Peter rose up, and said unto them, Men and brethren, ye know how that a good while ago God made choice among us, that the Gentiles by my mouth should hear the word of the gospel, and believe. 15:8 And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us; 15:9 And put no difference between us and them, purifying their hearts by faith. 15:10 Now therefore why tempt ye God, to put a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear? 15:11 But we believe that through the grace of the LORD Jesus Christ we shall be saved, even as they. 15:12 Then all the multitude kept silence, and gave audience to Barnabas and Paul, declaring what miracles and wonders God had wrought among the Gentiles by them. 15:13 And after they had held their peace, James answered, saying, Men and brethren, hearken unto me: 15:14 Simeon hath declared how God at the first did visit the Gentiles, to take out of them a people for his name. 15:15 And to this agree the words of the prophets; as it is written, 15:16 After this I will return, and will build again the tabernacle of David, which is fallen down; and I will build again the ruins thereof, and I will set it up: 15:17 That the residue of men might seek after the Lord, and all the Gentiles, upon whom my name is called, saith the Lord, who doeth all these things. 15:18 Known unto God are all his works from the beginning of the world. 15:19 Wherefore my sentence is, that we trouble not them, which from among the Gentiles are turned to God:
Galatians 2:11 But when Peter was come to Antioch, I withstood him to the face, because he was to be blamed. 2:12 For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision. 2:13 And the other Jews dissembled likewise with him; insomuch that Barnabas also was carried away with their dissimulation. 2:14 But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews? 2:15 We who are Jews by nature, and not sinners of the Gentiles, 2:16 Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified. 2:17 But if, while we seek to be justified by Christ, we ourselves also are found sinners, is therefore Christ the minister of sin? God forbid. 2:18 For if I build again the things which I destroyed, I make myself a transgressor. 2:19 For I through the law am dead to the law, that I might live unto God. 2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me. 2:21 I do not frustrate the grace of God: for if righteousness come by the law, then Christ is dead in vain.