Those who have been born into God’s family do not make a practice of sinning, because God’s life is in them. So they can’t keep on sinning, because they are children of God. So now we can tell who are children of God and who are children of the devil. Anyone who does not live righteously and does not love other believers does not belong to God. (1 John 3:9-10 NLT)
When Adam disobeyed God, sin entered and infected the whole world.
Even though we are sinners in this life, that is not really the end of the story. As Christians, we are now image bearers of God and we are made saints in Christ.
A child of God is easily distinguishable from the child of the devil. The former does not keep on sinning because God is alive in him.
If you are a child of God and you follow Christ, sin has no power over you. You are no slave of sin. God has already defeated the power of sin your life. Ask for His help to get you out of whatever it is you are struggling with.
Your identity in Christ is that of a saint and not a sinner.