How are pagan Gentiles saved in this lesson?

Les explains that Peter could not quite comprehend that God would save pagan heathens without requiring them to embrace the Mosaic system, keep the Law, be circumcised, and meet all the demands placed on a proselyte. Salvation for such Gentiles was by grace plus nothing, which was hard for Peter to accept. Peter warns that Paul’s letters contain things hard to be understood, which the unlearned and unstable twist, as they do other Scriptures, to their own destruction. Peter says that for salvation today one should not go back to the Gospels, Christ’s earthly ministry, Pentecost, or what he told Israel; instead, go to Paul’s epistles, where salvation is found. Les then returns to Galatians 1:17, noting the phrase about returning again to Damascus and going up to Jerusalem after three years.