Then imagine the danger lifted, the disaster averted. This is actually the plan of God Himself. The Galatians were apparently turning away from the truth. They were becoming traitors, said Paul, to the One who called them. It wasn't Paul they were deserting but God.
Moral problems can tarnish a church's witness, but changing the gospel kills it from within.
A church confused about the gospel is worse than worthless. A pastor's job is to remind the people of the gospel. Most obvious here is that the two gospels were pointing different places, had different conclusions. In verse 10, Paul says he has a choice to make, to please God or to please men. He realizes he cannot do both.