What happens when I tie church membership, baptism, the Lord's Supper, or good works to my salvation?

Les explains that circumcision was the big deal in Paul's day because Jewish people were bringing it into the Gentile churches. But he applies the principle more broadly: anything done in the energy of the flesh—joining the church, being baptized, taking the Lord's Supper, or good works—if tied to salvation, cancels the work of the cross. God is adamant that He finished it and did everything needed. If we are not satisfied with that, He is not accepting us. Paul repeats that anyone circumcised becomes a debtor to do the whole law, yet only Christ ever kept it; keeping the whole law is an utter impossibility. In verse 4, Christ becomes of no effect; He cannot touch us as long as we try to do something in the energy of the flesh. Those justified by law, legalism, or flesh-works have fallen from grace—not saved and fallen out, but turned their back on what God provided.