David wrote in Psalm 51 after he was confronted by Nathan, "Against you, and you alone have I sinned, and done what is evil in your sight." When he wrote these words he had coveted and committed adultery with Bathsheba, killed her husband, cause the death of their new born baby, and covered up the whole thing. But in all of this David knew what sin truly is. Sin is an offense against God.
In our legalistic mindset we equate sin with breaking a law and not breaking a relationship. God doesn't send people to hell because they broke some law, but he does require death for those that break their relationship with Him. When a person sins the offend the King of Kings and The Lord of Lords. God has said the wages of sin is death. If a person choses to offend the King, there is hell to pay.
Paise God that in our defense He sent Jesus to pay that penalty of death so that the relationship with God might be restored and we would have to die. But even for a Christian that has been saved from hell, there is still a need to guard his relationship with the King.
Over the years as I counsel with people I have heard them say. I know the Church doesn't agree with this but ___________________. Although I'm glad they recognize the authority of the Church, the Church is not the one they are offending. They are offending God. It is God who doesn't agree with your sin. It is God that is frustrated with your actions. And even though the church may not know what you are doing, God sees you in your house, at the bar, in your bedroom, and at your computer. It would be better to be concerned with what the King sees more than what the church sees.
This is the difference between having a relationship with God and a religion about God. Is your life an offense to God. Are you in need of repentance. Don't come and repent to the Church. First, fall on your knees and cry out to the one who saves your soul and get things right with God, then with God on your side go and make things right with everyone else. "If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse use from all unrighteousness."