well we can get into a discussion about knowing disobedience was a sin while they were in a state of ignorance of such knowledge...
i don't see this adding up.
Disobedience IS sin. They knew God told them not to eat it and if they did they would die. It was the one sin they were given knowledge of directly by God. Romans 5 explains it and emphasizes it over and over again: (note the underlined repeatedly saying one man sinned and brought sin and death to all. The good news is what's not underlined. Remember, this is the hidden mystery of Christ to Paul and is God's Word and full revelation of his amazing plan of salvation, concluding all under sin that he may have mercy on all through Jesus Christ.)
Romans 5
1Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:
6For when we were yet without strength, in due time Christ died for the ungodly.
8But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
9Much more then, being now justified by his blood, we shall be saved from wrath through him.
10For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.
11And not only so, but we also joy in God through our Lord Jesus Christ, by whom we have now received the atonement.
12Wherefore, as
by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
13(For until the law sin was in the world: but sin is not imputed when there is no law.
14Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of
Adam's transgression, who is the figure of him that was to come.
15But not as the offence, so also is the free gift. For
if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many.
16And not as it was by
one that sinned, so is the gift: for the
judgment was by one to condemnation, but the free gift is of many offences unto justification.
17For if
by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.)
18Therefore as
by the offence of one judgment came upon all men to condemnation; even so by the righteousness of one the free gift came upon all men unto justification of life.
19For as
by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous.
20Moreover the law entered, that the offence might abound. But where sin abounded, grace did much more abound:
21That as
sin hath reigned unto death, even so might grace reign through righteousness unto eternal life by Jesus Christ our Lord.