What does Paul teach that we actually do for salvation?
Paul's doctrine says that for salvation we do nothing but rest on and believe what God says He has finished on our behalf. That finished work is the Gospel: the death, burial, and resurrection of Christ. We are not saved by law-keeping but by faith, just as Abraham believed God and it was accounted to him for righteousness.
Les explains that legalism appeals to the human concept of having to do something, but Paul's doctrine says we do nothing. Instead, we rest on and believe what God says He has finished on our behalf. That finished work is the Gospel—the death, burial, and resurrection of Christ. In Galatians, Paul is refuting false doctrine, primarily the inroads of legalism. He reminds believers that they did not enter their glorious position by law-keeping but by faith, by believing the Gospel. As an illustration of faith, Paul goes back to Abraham in Galatians 3:6: 'Abraham believed God, and it was accounted to him for righteousness.' Les points out that Abraham did not bring sacrifice, keep commandments, or get baptized in the Jordan; he did nothing but believe God.