While the idea that Christians have a sinful nature is rampant throughout Christian teaching, the Bible does not actually teach this concept. Instead, it teaches we believers have a brand new, righteous self through the resurrection of Christ (2 Peter 1:4; Colossians 3:1; Romans 6:18). Even though we still sin, we are not sinful by nature at our core anymore. We have been born again, and we are now the righteousness of God (2 Corinthians 5:21)!