The Bible says that we are set free from our sin and translated out of the Kingdom of darkness. Why do People who become Christians continue to practice sin?
Unless we make the cognitive choice not to sin, you can’t escape the old sin nature. That’s why Paul lamented several times in his letters about this old bundle of sin! Romans 7:24 O wretched man that I am! who shall deliver me from the body of this death? 7:25 I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin. This whole chapter deals with your very question. The verses below may also be of some help to you.
Galatians 5:19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, 5:20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, 5:21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. 5:22 But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, 5:23 Meekness, temperance: against such there is no law. 5:24 And they that are Christ’s have crucified the flesh with the affections and lusts.