A person who is born again cannot practice sin, because God's nature is in him. To practice sin, is to live a life of sin because of love for it. The one who practices sin is not born again and is still dead in sin. That person possesses a character like the devil. Whatever the devil does such a person will do, for every being live according to its nature.
They have been many persons throughtout history who have claimed to be Christians, but have lived a life of sin because of love for it. Such persons are conterfeits, not real Christians. True Christians love righteousness because they have the nature of God and God is righteous.
If you claim to be a Christian but you love sin you are not a Christian. You need to be born again by asking Jesus to forgive you of your sins and come into your heart to live. If you do, you will fall in love with Christ. You will hate sin and love righteousness. Your life will reflect the righteousness of God rather than the unrighteousness of the devil. Examine yourself today to see whether or not you are a Christian.
"No one who is born of God will continue to sin, because God's seed remains in him; he cannot go on sinning, because he has been born of God. This is how we know who the children of God are: Anyone who does not do what is right is not a child of God; nor is anyone who does not love his brother," 1 John 3:9 - 10