Galatians 3 introduces a key figure the argument of the letter, that of the patriarch Abraham. It is possible that Paul is only reacting to the fact that his opponents have introduced Abraham into their own arguments, but it is far more likely that Paul introduces Abraham for wholly other reasons. In Galatians 3:6-9, the Apostle argues that faith is what unites God's people, and that those who are defined by faith, are the true children of Abraham, and, therefore, the true people of God.