No, I am glad you made your error so clear. Or maybe you misread me.
The whole reason Paul was going "ape" in Gal 1:9 was because after he left Galatia, some Jewish Pharisee Christian converts came from Jerusalem and were insisting that the Gentile converts to Christianity had to be circumcised.
THAT is the reason Paul wrote Galatians. This is summarised in Gal 5:1-3 and Gal 6:12-16. Period.
No, that is not the reason Paul wrote Galatians. That was merely a side issue. Not the reason for writing Galatians and having nothing to do with the Gospel Paul preached.
Paul makes it clear that his Gospel was not that preached by the Apostles or our Lord when He walked the earth. It was given Him by revelation of the Risen and Ascended Lord.
Gal. 1:11-12 But I certify you, brethren, that the gospel which was preached of me is not after man. 12 For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.
Paul wrote Galatians to explain the difference between the Law and Grace, as he did all his letters.
Gal. 2:2 And I went up by revelation, and communicated unto them that gospel which I preach among the Gentiles, but privately to them which were of reputation, lest by any means I should run, or had run, in vain.
And this is the purpose of Galatians....that the law was merely a schoolmaster to lead us to faith in Christ. Justification by faith...not by works (circumcision or
any other kind of work or self effort).
Gal. 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.
Therefore, any who preach a false gospel, that has man earning his salvation by his own obedience or effort (of any kind), is to be accursed. Not only circumcision, or special days, or obedience to commandments, or sacrificing time or money, or unclean foods, or rites and rituals....none of it will save. The freewoman vs. the bondwoman....