Note 12 at Gal. 1:10: Paul is stating, "I'm not preaching man's gospel. I'm not trying to please man." The word for "persuade" in the King James Version is PEITHO (pi-tho) and means "to win over, and render friendly to one's self" (Wuest's Word Studies, p. 42). Paul was not trying to win people over and make friends by preaching what people wanted to hear. If that were the case he would not be a true servant of Christ.

Paul states in 1 Thessalonians 2:4, "But as we were allowed of God to be put in trust with the gospel, even so we speak; not as pleasing man, but God, which trieth the hearts." As a "servant," Paul had only one master and that was Christ (Mt. 6:24). Therefore, he spoke only the message the Lord laid on his heart.

All of this is being said to make the point that the gospel Paul had brought to the Galatians was directly from God, not man. He elaborates on this point all the way into the second chapter. The reasoning is that if God truly gave Paul this message, then there could be no room for change. The Lord is always the same and His message never changes.

Likewise, there is no room for a modern gospel today that fits the culture we live in. It's the same gospel Paul preached, which is the power of God unto salvation today (see note 1 at Rom. 1:16, p. 744). Methods can change, but the message must remain the same.