What’s the “other gospel” that the Galatians are being beguiled by? (Galatians 1:6) If I’m not mistaken, it’s the Judaizers -- who wanted to add the works of the law to the Gospel of Jesus Christ.
We often get the impression from the 4 Gospel accounts that the Pharisees were dead set against Jesus. But actually, many Pharisees became Christians -- their belief in the resurrection (as opposed to their rivals the Sadducees, who didn’t believe in the resurrection.)
These Pharisee Christians ended up trying to influence the church to make the Gentiles essentially become Jewish proselytes first -- and follow the Old Testament Law -- to be “real” Christians.
But how do we actually get rescued? “Grace and peace to you from God the Father and our Lord Jesus Christ, who gave himself for our sins to rescue us from this present evil age according to the will of our God and Father, to whom be glory forever and ever! Amen.” (Galatians 1:3-5)
Salvation is by grace through faith, not of works. It is a gift of God. (Ephesians 2:8). Jesus did it all. We can’t add to it.