You are both right.
Ever heard of rebirth?
If you mean no one can possibly be sinning, and be born of God, at the same time, I agree.
But I believe the other was saying something completely different: There is a tenet of OSAS, where the law of God on paper no longer exists, so that man can no longer transgress that law,
so long as they are not keeping themselves under it, seeking to do what is written on paper.
By declaring the law of God to be dead on paper, they remove themselves from doing it as written: they even go so far as to denounce those doing so as self-righteously decieved, as well as,
God forbid!, not trusting in the work of Christ already done on the cross.
It is a very subtle delusion, because the result is to become a law unto ourselves, where we only live by faith
from within, and not by any objective outside letters on paper, even the ones in Scripture.
It truly is unique and a masterful deception of the wicked one: we all live by our own faith within only, and there is no law on paper that can accuse nor condemn us: Thus, we are delivered from the law of Scripture and the condemnation of the law, not from transgressing the word written in Scripture.
But, as with all lies of the devil, it begins with one single glaring fault, such as
"Ye shall surely die", which in this case is that the law of Moses on paper is old and gone with the OT, but not the law of CHrist on paper for the NT: There is still law of God written with ink on paper that defines and condemns transgression thereof.
All men are still held accountable and judged by the law of God in Scripture, which today is that of Christ written by His apostles.
Those who do know Him and keep His commandments, to do His word and law with a pure heart, don't need to daily remind ourselves of what is written, as perhaps them of old, but the law is still there just in case there is a dispute about what is written and what is not.
There are three main reason for the law of Christ being codified in Scripture, and
not only in our hearts and minds:
1. To put to silence the hypocrites.
2. To correct them of faith.
3. To put to silence those who add to His law their own traditions and commandments, as did the Pharisees.
There also is a 4th I believe is true: God does not write His law in our minds
all at once with newbirth, but rather only promises to do so as we continue to read and learn and
do it in our lives.
If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself. (John 7)
Afterall, if the whole law and word were written in our minds all at once, then why need to read it, much less learn anything from it? We would already know it all.
We must still hide the word in our hearts, as the prophet declares, but with the blood and Spirit of Christ, every single little child of God can do so: it is no more reserved only for the prophetic few:
And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD. (Jerem 31)
But thou, O Daniel, shut up the words, and seal the book, even to the time of the end: many shall run to and fro, and knowledge shall be increased. (Dan 12)
The last days and time of the end began with His resurrection, and are still here:
Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time. (1 John 2)
The good thing about realizing our times and days are really nothing so special, over any other times and days, is that we simply understand we are
supposed to be that way: it's not unique but simply necessary. It also deflates pride in being some sort of last days guru.
One declared to me the 'last Elijah'. I laughed. I haven't heard from them since. (I hope I wasn't wrong
)