These are two distinct and contrary personalities
1 John 3:8-9 KJV He that committed sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that He might destroy the works of the devil. Whatsoever is born of God doth not commit sin.; for His seed remaineth in him: and he cannot sin, because he is born of God
A sinner is of the devil, inothe words a sinner is anyone who is of the kingdom of the devil, which is the kingdom of darkness or the kingdom of SIN.
But a Christian is that person who is born into the kingdom of God, which is the kingdom of Light or the kingdom of righteousness.
Collosian 1:13 KJV Who hath delivered us from the power of darkness, and hath translated us into the kingdom of His dear Son
We were once all sinners and under the captivity of the powers of the kingdom of the devil/darkness/SIN.
ROM 3:23 KJV For all have sinned and come short of the glory of God
But God paid a ransom to deliver us from the captivity of SIN.
Collosian 1:20-22 KJV And having made peace through the blood of His cross,by Him to reconcile all things unto Himself;by Him,I say, whether they be things in earth,or things in heaven. And you, that were sometime alienated and enemies in your mind by wicked works,yet now hath He reconciled in the body of His flesh through death, to present you holy and unblameable and unreproveable in His sight.
A Christian is HOLY, UNBLAMEABLE AND UNREPROVEABLE IN THE SIGHT OF GOD