Intentional sin and forgiveness
What if a person believes in Jesus as their Savior from sin but that person continues to intentionally or willingly do or live in at least one sin (like being greedy, driving over the speed limit, living as a homosexual, etc.)? Do passages like Romans 8:12-13, 1 Corinthians 6:9-11, Galatians 5:19-24, Hebrews 10:26-31, and 1 John 3:4-15 go against such thinking and living? Therefore, could a believer in Jesus as their Savior from sin go to hell if that person intentionally does or lives in at least one sin the rest of their life until death?
In the sermon on the mount Jesus taught: “Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father who is in heaven” (Matthew 7:21). God’s will is that people repent of their sins and trust in Jesus Christ as their Savior through the power of the Holy Spirit (Mark 1:15).
Passages that you cited, especially 1 Corinthians 6:9-11, teach that impenitence over sin—not any one particular sin—bars people from the kingdom of God. An outward profession of faith in Christ, accompanied by willful sin and an impenitent attitude, is not a description of saving faith. The words of Christ from the sermon on the mount previously cited can be applied to people who lull themselves into spiritual apathy toward sin and yet claim an allegiance with the Lord.
Sin is serious. It is so serious that it cost the life of God’s Son. God’s will is that people who enjoy his forgiveness through faith in his Son live a new life to his glory (Romans 6:1-4).