What did Paul preach about how a person is saved?
Paul preached that a person is saved by faith in the gospel of the grace of God—specifically faith in Christ's death, burial, and resurrection—and by faith alone, without the law. Those who believed were baptized or placed by the Holy Spirit into the body of Christ.
Les teaches that Paul began to preach the message of Christ's death, burial, and resurrection, and that salvation is by faith, and faith alone, without the law. As men and women believed that message, the Holy Spirit baptized or placed them into the body of Christ. This fits the context where Gentiles at Antioch came in by faith in the gospel of the grace of God and were first called Christians.