Our hope is in Jesus Christ and abiding in Him. But shall we continue in sin so that grace may abound? Paul says, God forbid. Meaning, we cannot commit sin. For Paul lists certain sins like murder, hate, adultery, theft, idolatry, lying, and drunkenness, etc.; Paul says they that do such things will not inherit the Kingdom of God. Paul says be not deceived in regards to this matter. So this is talking to the believer. Paul says, examine yourself whether Christ be in you or not. Meaning, if Christ lives within us, then good fruit and not bad fruit will be evident within our lives. For there is no Condemnation to those who are in Christ Jesus who walk after the Spirit and not after the flesh. How do we know we are walking after the Spirit and not some other spirit? By seeing if our life is lining up with God's Word or not. If it is not lining up like it should be, then we have God's grace that we can gain access to so that He can change us.
But is a Christian saved by getting baptized? No.
Are they saved because they pray a lot? No.
Are they saved by giving to the poor? No.
However, when a person is saved by God's grace, they will exhibit a change in their life and God will live in them and do the good work in their heart and lives. Good fruit will result and not bad fruit.
As for Romans 7:
Paul is talking about his experience before he became a Christian when he was a Jew trying to wrongfully be justified by the Law.