The fact that you don’t drink alcohol, smoke and fornicate does not make you a Christian, it is through faith in Christ that we Christians. There are sins of the heart which we don’t see with the physical eyes. A relationship with God is a heart issue.
Galatians 3:19 Why, then, was the law given? It was given alongside the promise to show people their sins. But the law was designed to last only until the coming of the child who was promised. God gave his law through angels to Moses, who was the mediator between God and the people.
Following the law does not guarantee us salvation, it is through believing Jesus Christ that we are saved. Galatians 3:22,27 But the Scriptures declare that we are all prisoners of sin, so we receive God’s promise of freedom only by believing in Jesus Christ. And all who have been united with Christ in baptism have put on Christ, like putting on new clothes.
One cannot have have Christ in him but continue with his old ways. Christ in us will help us move away from sin.