The "Book of Galatians" is the letter of Paul to the
churches in Galatia.
Paul
addresses this letter to the churches
in Galatia which is in central Asia Minor. His message is very important which he immediately writes in chapter 1. He makes two things clear: that he is a true apostle and that his message is the only true message. He even corrected Peter his ways, when the latter had stopped eating with Gentile followers who were not in obedience to the Law of Moses, chapter 2.
The Book of the Galatians consists of 6 chapters and include the following: Paul gives his only true message, how Paul became an apostle, he corrects Peter at Antioch, he rebukes the Galatians and stresses that faith is the only way, the law and the promise, about slaves, about the children, his concern for the Galatians, Hagar and Sarah, that freedom is given by Christ, about God's Spirit and our desires, Paul's reminder to help each other, and his final warnings.
According to Paul, faith is the only way to be saved. He insists that this is true from Abraham in the Old Testament, who received God's promise by faith.