Authorship is traditionally attributed to Paul the Apostle, writing for the churches in Galatia between 49 and 58 AD.

[3] Instead of expression of thanks given to God for the audience typically found after the greetings in genuine Pauline epistles,[7][8] Paul criticizes the Galatians for deserting his teaching of God's grace, and calls those who spread what he considers a fake gospel as anathema.

[9] Paul claims that his proclamation of the gospel is not of human origin but directly from the revelation of Jesus Christ.

[10] The clarifying account of Paul's pre-Christian life may be a response to an effort by his opponents to use it to undermine his authority.

[11] The word 'Judaism' in verses 13 and 14 are the only two references in the whole New Testament, and not until half a century later in the writings of Ignatius, 'Judaism' and 'Christianity' are considered two 'religions'.