Why does Paul introduce himself as Paul rather than Saul?
Galatians 1:1 (ESV)
1Paul, an apostle not from men nor through man, but through Jesus Christ and God the Father, who raised him from the dead
It is not clear why Paul is using his Roman name (Paul)1 rather than his Hebrew name (Saul, see Acts 13:9). Most probably it has to do with the fact that he is addressing churches that are predominantly made up of believers from a Gentile background.2
1 Paul, an apostle not from men nor through man, but through Jesus Christ and God the Father, who raised him from the dead