1 John 1:9-10. “If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness. If we claim we have not sinned, we make him out to be a liar and his word is not in us.” You and I continue(d) to sin after were born again. “There is now no condemnation for those who are in Christ Jesus”, not because we no longer sin, as you say, but because our sins are covered by the blood of Jesus.
This works, if the salvation promise has been accepted.
We are shy to accept the power of the salvation promise and that is why we try to class certain sins as being impossible for a Christian to commit (and usually, conveniently, those are sins we don’t believe we commit).
But the acceptance has to be real. The work of the Spirit will begin to tell in that person’s life. That person will end up being called short on his or her sins if so.
It is difficult to describe because worldly language does not have good terminology for it.