I have read your article "Romans 5:16-19 - The Sin Nature, The Source of All Grief, is Defeated in the Born Again Believer" and am struggling with the premise that our born again experience has removed the sin nature. Your statement "The sin nature has been completely destroyed and removed. God's abundant grace overwhelmed and overcame it much in every way" is not a reality in the life of the believer. Romans 7 speaks to the nature of sin living right in the midst of our born again lives. In other words, God has given us the power OVER SIN with our new nature, but not the removal of the PRESENCE of sin. If the sin nature was removed, we would never sin again, and therefore would have no need of 1 John 1:9.
Thank you for taking the time to read this article and pose a question. First, you have to understand that we are made up of 3 parts according to I Thessalonians 5:23, A spirit, a soul and a body. Our spirit is our life force. It is the part of us that was born again when we put our faith in Jesus. The default sin nature was taken out and we were give a new spirit that is identical to Jesus (Romans 6:6-7, Ephesians 4:24, Colossians 1:13, I John 4:17). Which is why were are a new creation in Christ (II Corinthians 5:17). The believer’s spirit is the part that has been sanctified, sealed and redeemed (Ephesians 2:13-14, Romans 8:15-17). The spirit you have now is the same spirit you will have for all eternity, it is perfect because it is identical to Jesus, therefore no sin can exist in the born again spirit, because Jesus was sinless (Romans 8, Hebrews 10:10, Hebrews 10:14).