Ok, I see where the confusion is coming in here... let's try this.
1) What was the first word that Jesus started preaching in his ministry? It was "REPENT" (the kingdom of God is at hand). Repent, whatever your personal "definition of it" might be, is to recognize that sin is bad, that its wages is death, and that you should stop doing it. Then, to commit in your heart to stop sinning, to resist temptation, and to seek the kingdom of God. So when you repent, you abhor sin as defined by the law, and follow Jesus Christ, even to your own personal cross.
Now, every now and then we stumble and sin. We then confess, tell God sorry, and the blood of Jesus covers us. How? Like this.
Remember the adulteress, who was caught in the very act of adultery, it was prescribed by the law that she must die. But Jesus didn't condemn her. What did he do with her sin, sweep it under the rug? No, he knew that he was going to DIE for her sins. That her death penalty was put onto HIM. That his blood, the very blood of the son of God, would be required to satiate the righteous requirements of the law. Notice he also said to the woman "sin no more". He says that to us too. The same man who told us to "if your brother sins 7 times and repents 7 times, forgive him", well Jesus forgives us too when we repent, each and every time. Repentance isn't feeling bad and dwelling in it, its a commitment to follow the Lord and stop sinning, and to live by our Spirit.
This is a big principle in the Christian life, WE ARE BORN OF THE SPIRIT. God used to write on stone, but now, at each moment of the day, he writes on our hearts. If a born-again believer starts to sin, he loses his peace, and so he should repent and reconsider his actions. Even actions that seem right but cause us to lose our peace, this is God talking to us. It is the law of the spirit of life. We used to follow "right and wrong", but now we follow "life".
Its like a fountain of water within our very spirit.
Then what about the law? Well its still there till heaven and earth pass away, but while we are IN CHRIST we are exempt from it because he died for those transgressions. However, the new law is at the same time more restrictive, but also it gives us the ability, through the Spirit, to obey it better.
There are still the Lord's commandments, no matter what we think of the Mosaic law: "Love one another even as I have loved you". How did Christ love us? Well, he bore our burdens, he didn't condemn us, he sacrificed everything he had for us, and he even went to the cross and died for us. Do you understand?
We sometimes feel a burden, and so we seek to relieve that burden by following the Lord's direction in our heart to regain our peace. God is sovereign. Remember that, God is sovereign. He is not sitting on his thumbs, he is working with each person all over the world, to bring them to believe in Christ.
What is the work that God requires? To believe in the one that He hath sent.
What did the one that he sent say? To love one another as He has loved us.