Doesn’t matter.
Humans from birth have a genetically transmitted old sin nature.
We do not begin life with a regenerated human spirit. We do begin life upon birth with a soul imputed with life from God, and a body imputed with biological life.
A vocabulary word used by Greek archers on the practice range, “Sin” is simply “missing the mark”. The mark in context is God’s Plan.
Humans have volition and in our thinking, whenever we think independent of Him, we step out of line,...i.e. we have missed the mark, we have sinned.
We too often associate sin with immorality or transgression of the law. While such behavior is indeed sinful, sin is much simpler to understand when in fellowship with Him as ANYTHING other than walking by His Plan.
God’s Plan was for Adam to not eat from the tree of knowledge of knowledge of good and evil. Once eaten the human species fell out of fellowship with God. Our human spirit was no longer with God.
While Christ has redeemed us from the slave market of sin, we have not been forgiven until we exhibit faith in Him. His grace is given to those with faith for their continuing sanctification, in preparation for rewards we will use for eternity future. Until we are able to comprehend the Gospel, should we suffer the first death, He is free from the payment at the Cross to forgive us for those things we did not understand, because He has paid the price for ALL sin.
This is why children who die before the age of accountability and idiots or the mentally deficient will have eternal life and not automatically condemned to Hell. It’s all His Work.
The unbeliever though has evidence of His Plan in all things about him, so even if not being exposed to the Gospel, he is without excuse if both is name is blotted out of the Book of Life and his works lack Divine Righteousness when they are judged. If an unbeliever were perfect and without sin, he would find nothing wrong with Christ and those who follow and walk with Him.
Eh, that’s your belief... and it’s wrong.