Why was Paul afraid for the Galatians in Galatians 1?
Paul feared for the Galatians because they had been deluged by another gospel, which is not really another but a perverted one. He warned that anyone coming to them preaching any other gospel than what he had preached should be accursed.
Les explains that in Galatians chapter 1 Paul expresses fear for the Galatians because they had been deluged by another gospel. Les points out that Paul clarifies this is not really another gospel, but a perverted one. Paul then makes a dramatic statement: if any come unto you preaching any other gospel than what I have preached unto you, let him be accursed. Paul's concern is that the Galatians were being influenced by a corrupted message that differed from the gospel he had preached.
I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:
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What does Paul mean when he says the Galatians turned to another gospel?
The 'another gospel' Paul mentions is not really a different or totally different gospel; it was the same gospel Paul had used in establishing the Galatians, but it was now being perverted, polluted, and corrupted.