What did Paul preach to the pagan world and what happened when he did?
Paul preached to the pagan world nothing but the Gospel of the Grace of God. When he did, abject pagan people came out of their paganism and became believers—called Christians—though that term later lost its efficacy, since today almost anyone can be called a Christian.
Les explains that Paul's message was directed to the pagan world. He could come to abject pagan people with nothing but the Gospel of the Grace of God, and they would come out of their paganism and become believers, or Christians, although that term certainly lost its efficacy. Les also notes that when we talk about the Gospel of Christ, we must go back to where it is most explicitly laid out, 1 Corinthians 15, the clearest explanation of Paul's Gospel. Paul refers to it as the Gospel of the Grace of God, the Gospel of God, My Gospel, and the Gospel according to the revelation of the mysteries. The context adds that there was not another Gospel being brought, but a perversion of the Gospel of Christ.