Did the false teachers eventually succeed in turning the Galatian churches away from Paul?
Yes, the perverters evidently succeeded, which is why Paul had to write to Timothy that all in Asia, including Galatia, had turned against him. The Galatians were slipping into another gospel, a perversion, and false teachers tore the congregations apart after Paul left.
Les explains that the false teachers were Judaizers demanding circumcision and law keeping over against Paul's pure Gospel of Grace. Paul marveled that the Galatians were so soon removed from the one who called them into the grace of Christ, and they were slipping into the influence of another gospel—not another, but a perversion. These troublemakers would pervert the gospel of Christ. The perverters finally succeeded evidently, since Paul later wrote to Timothy that all in Asia, including Galatia, had turned against him. While Paul was physically present, the congregations could hold together; after he left, false teachers came in like ravening wolves and tore the little congregations apart.
Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.
This thou knowest, that all they which are in Asia be turned away from me; of whom are Phygellus and Hermogenes.
Were the Galatian false teachers preaching a completely different gospel?
No. The Judaizers were not preaching a totally different gospel; they were polluting and corrupting Paul's gospel by adding works. They insisted salvation required faith plus circumcision and keeping the Law of Moses, which is a corruption of the truth.
What were the false teachers in Galatians 1:7 actually bringing?
They were not actually bringing another gospel. Their message was a perversion of the Gospel of Christ. It was a corruption, not a legitimate alternative. The Gospel of Christ must be understood where it is most explicitly laid out, 1 Corinthians 15:1-4, the clearest explanation of Paul's Gospel.
More Questions
Was the 'another gospel' in Galatians a completely different gospel?
The 'another gospel' the Galatians were slipping into was not something totally different but a perversion of the Gospel of Christ.
What were the false teachers in Galatians 1:7 actually preaching?
The message the troublemakers in Galatia brought was not actually another gospel, but a perversion of the Gospel of Christ.