Paul is astonished that the Galatians are turning from the God who called them in grace toward a message he refuses to call good news. The test is not whether a claim sounds religious but whether it matches the gospel they received.

Paul is stunned that the Galatians are turning from the God who called them in grace toward a message that only looks like good news. The test is not the messenger's impressiveness but whether the message matches what was first preached and received.