1 John 3:9 “Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.”
If you believe a true Christian cannot stop sinning then you do not believe the Scripture. Read slowly and carefully what I have posted: Whosoever is Born of God doth not commit sin.
There is a false Christianity that teaches this is not true.
He who has ears to hear let him hear.
Romans 7:22 For I delight in the law of God, ein my inner being, 23 but I see in my members another law waging war against the law of my mind and making me captive to the law of sin that dwells in my members. 24 Wretched man that I am! Who will deliver me from this body of death? 25 Thanks be to God through Jesus Christ our Lord! So then, I myself serve the law of God with my mind, but with my flesh I serve the law of sin.