The fact that we are justified by grace through faith means we have spiritual freedom. We are not under bondage to the dictates of the Old Testament Law. Paul soundly condemns anyone who would denigrate the grace of God and attempt to change the gospel (Galatians 1:8–10). He gives his apostolic credentials (Galatians 1:11–2:14) and emphasizes that righteousness comes through Christ not the works of the Law (Galatians 2:21). The Galatians must stand fast in their freedom and not be “entangled again with a yoke of bondage (that is, the Mosaic law)” (Galatians 5:1). Christian freedom is not an excuse to gratify one’s sin nature; rather, our freedom is an opportunity to love one another (Galatians 5:13; 6:7–10). The Christian life is to be lived in the power of the Spirit, not the flesh (Galatians 5:16–18). The flesh has been crucified with Christ (Galatians 2:20); as a consequence, the Spirit will bear His fruit in the life of the believer (Galatians 5:22–23).
In the end, the issue is not whether a person is circumcised but whether he is a “new creation” (Galatians 6:15). Salvation is the work of the Spirit, and we must be born again (see John 3:3). External religious rites such as circumcision are of no value in the realm of the Spirit.
For a more detailed summary select the link below.
The Book of Galatians Summary