Well, that isn't what I said.
I said we're not judges by the 10 commandments, but rather judged by the law of liberty which is how well we love our neighbor as ourselves:
James 2:12
12So speak ye, and so do, as they that shall be judged by the law of liberty.
If you break one of the 10 commandments, even secretly in your heart, or accidentally, then you're guilty of transgressing the whole law:
James 2:10
10For whosoever shall keep the whole law, and yet offend in one
point, he is guilty of all.
Given our inability to keep the law, Christ fulfilled the law for us so that by faith in His life death and resurrection we are justified by His righteousness. We access the grace of God by faith in Christ.
Romans 5:1-2
1Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:
2By whom also we have access by faith into this grace wherein we stand, and rejoice in hope of the glory of God.
We're not free to go on sinning as you suggested, nor do born again Christians want to sin, rather we are free to love our neighbor as ourselves in the law of liberty:
Galatians 5:13-15
13For, brethren, ye have been called unto liberty; only
use not liberty for an occasion to the flesh, but by love serve one another.
14For all the law is fulfilled in one word,
even in this; Thou shalt love thy neighbour as thyself.
15But if ye bite and devour one another, take heed that ye be not consumed one of another.
Galatians 5:22-23
22But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness,
23gentleness, and self-control. Against such things there is no law.