I don't believe the question is about good or bad. It's more of pure and unpure or scarlet and white. We were all born sinners and continue to be sinners, or unpure, until we accept Christ into our lives. Once He finds us and makes us His own we are no longer sinners. Jesus is what makes us pure. So He turns our scarlet transgressions into pure white, not keeping a record of sins, and casting all our sins as far as the east is from the west. But considering the word good, I know many "good" people that are sinners. Frankly, everyone I know is a sinner. So to be good and still be a sinner is possible.