What did the Judaizers teach the Galatians about salvation?
The Judaizers taught that Gentile converts could not be saved unless they embraced Judaism and kept the Law. They followed Paul everywhere, insisting that salvation required adopting Jewish practices and Law-observance, thereby denying that grace alone saves. They opposed Paul's message that believers are not under Law but under grace.
Les explains that the Judaizers were following Paul everywhere he went and would not give up. They maintained that Gentiles could not be saved unless they embraced Judaism and kept the Law. Paul hurriedly wrote his letter to the Galatians to admonish them not to give in, because they were not under the Law but under grace. The letter's purpose was to tell the Gentile churches in Asia Minor that they are under grace, not Law. Thus the Judaizers' teaching added Law-keeping to salvation, contradicting Paul's gospel of grace.