Salvation is by grace alone. It's important that Paul keeps coming back to this point. Righteousness by faith depends on God, not us. If you believe Jesus is the Christ, you are absolutely a child of God.
Questions to think about:
1. Why do you think Paul keep coming back to the teaching of salvation by grace alone through faith alone in Christ alone
2. Have you called upon the name of the Lord for salvation?
Romans 10:5-13