The wages of sin is death. Putting your sin onto Jesus is not getting away with it. If a christian is acting within christianity then they are workiing towards never sinning. When christians sin they trample Jesus. The bible warns against doing that. If a christian is unrepentant about continual sinning and never comes round to gaining self control, one has to wonder about whether they have salvation at all. That is for God to decide.
Before Jesus it didn’t matter what you did, you would still lose. Anyway, it is not through a christians power that she ceases to sin. It is through the life of God working in them to turn them away from it. On our own we fail.
God wants us to be dependant on Him. Like if you found a piece of land, and you knew that with the right cultivation you could really get a great harvest from it. Well, if you bought the land and left it to its own devices nothing would be reaped. God has paid for us, and is sowing and reaping. Sin in Christians is part of the land that still needs cultivation. Maybe it will take some people to die to fix there temptation.
Regardless, failures here on this planet are great training for everything God has planned for us while we are here, and when we join Him.
Bottom line is that a Christians responsibility is to not sin. When Jesus died, he freed us from sin once and for all. 1 COR 3:13 is the standard that christians must meet. Paraprhasing it says that what is built on the foundation of Jesus will be tested with fire. If you build with hay and rubbish…it is going to be burned up. You will be saved, but you will have nothing to show for your life. So Sins are like nothing being laid on the foundation. It is better that we build on the foundation of Jesus with better stuff that won’t get burned up.
Salvation is not the reward of sin. Salvation is the reward of a merciful God who loves us despite our sins. He did not have to help us. Noone has to accept His help either. Consider that if you murdered someone and the court decided to pardon you, would you tell the court that is unacceptable I want the death penalty??? The next day would you go out and kill someone else to see just how merciful the court really is??? I think it would be prudent in that situation to consider your good fortune for having been pardoned, and attempt to go out and live the life of an upright citizen from then on.
It is no different at all in Christianity. For us you are guilty of the murder of Christ until you receive salvation. When you do Jesus has said that He forgives you. Now, if you continue to sin without remorse then you are heaping coals on your head, like a man who has been pardoned and continues to offend despite the mercy that is shown.
God also said who is more upright, the man who sins and goes to the synagogue and beats his chest crying for repentance…or the person who has not sinned and thinks nothing of the judgment of God.
Or consider if two men are in your debt one $500, and one $5,000. If you forgive them both their debts, who will love you more for it.
Hope that helps.