Paul preached the gospel/good news of the Christ to the Churches of Galatia much in every same way as he did with the Churches of the Thessalonians and the one at Corinth–Gal. 1:11.

Nevertheless, a false doctrine soon found its way among them–Gal. 1:6-9.

This doctrine emphasized the persuasion that justification is by works of the law–Gal. 2:14-16.

However, Paul instructs the Churches of Galatia that justification is ONLY by faith–Gal. 3:11 But that no one is justified by the law in the sight of God is evident, for “the just shall live by faith.”