ESV: "We know that everyone who has been born of God does not keep on sinning, but he who was born of God protects him, and the evil one does not touch him.' (1 John 5:18)
Christians don't sin in the sense they relish it. They do "not keep sinning" with a 'don't care attitude.' They are under the conviction of the Holy Spirit, they do not enjoy sinning, they are bothered, they seek deliverance, etc. They possess a new found sense of holiness and 'keep themselves' holy before God, or, as Jude challenges, "Keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life" (Jude 1:21). This very conviction and uncomfortableness with sin, all of which true believers most certainly feel within, interestingly assures us that we belong to Him!