7 Understand, then, that those who believe are children of Abraham. All nations will be blessed through you. So those who have faith are blessed along with Abraham, the man of faith. Clearly no one is justified before God by the law, because, The righteous will live by faith. He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus, so that by faith we might receive the promise of the Spirit.
Desertion is wrong because it shows disloyalty and betrayal.
Few things are worse than a Christian who deserts the gospel. The Galatians deserted the gospel to follow a falsehood. They left to follow a false form of Christianity. It was supposedly an improvement of the gospel. It was a worthless counterfeit.