Just what is "sin" anyway? Sin is any thought word or deed that goes against God's will; doing what God forbids, or not doing what He commands.
People wonder why the Passion of Christ was so bloody and terrible. But consider all the sin that needed to be paid for! This is why Jesus came – to make this payment on behalf of all mankind. And that is exactly what He did with His life, suffering, and death! That's why His life was so short and hard, His suffering so harsh, and His death so horrific. But now the price is paid, totally and completely. We don't have to pay it. All we have to do is believe it! And that's the point!