The problem that I hear so often amongst believers, is that they still claim to be sinners after they have received Jesus Christ as the Lord and Saviour of their life. If a man is a sinner before finding salvation, and he is a sinner after salvation, then what is the purpose of salvation? My Bibles says that "Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come." (2Cor. 5:17) The Bible states that "All HAVE sinned" but if we are in Christ, "For our sake he made him to be sin (our sin sacrifice, the Paschal Lamb) who knew no sin, so that in him we might become the righteousness of God." (2 Cor. 5:21)
When we come into this world, we are born as sinners. It is not my point to show my way of thinking, but only what is the "mind of Christ." Jesus' opinion is all that will matter when we appear before the Throne of God. Not everyone who sins is a sinner. Let me give you an example: If a kid was to puff on a cigarette and then throw them down and not pick them back up, he would not be considered a smoker. A smoker is one who does it all the time and enjoys it. A sinner sins because he is a sinner. That is his nature to do so. A Christian cannot be a sinner, because that is contrary to Christ and the nature of God. Is it possible that a Christian can sin? Yes, I think most of us would say "Obviously!"
Is it possible that a person can sin from time to time and not be considered a "sinner?" Yes! We have an Advocate with Our Father in Heaven, and His name is Jesus. Through Faith in Jesus Christ and the atoning blood of Jesus, we are justified by our Faith in Christ. How does Jesus and Our Heavenly Father see us? He sees us as the "Righteousness of God through Christ Jesus, our Lord." We are now "Children of God." A child of God does not go looking for sin. A child of God's desires is to please the Father.