Hi Iname,
You say that the decision to disobey that A&E made was the first sin.
Man did not commit the first sin.
But sinning is an act of volition, so how could A&E's decision have been a sin when they had no understanding that it was wrong
Volition is the study of will, choice, and decision.
Volition has nothing to do with understanding what is right or wrong.
Freewill has nothing to do with understanding what is right or wrong.
Sinning, the act of committing a sin (an act that violates a moral rule)
Sinning - Wikipedia
God specificaly in His words nothing left for the man to interpet told the man.
Gene 2:16 (KJV) And the LORD God commanded the man, saying, Of every tree of the garden thou mayest freely eat:
17 But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die.
The woman did not commit sin when she was begiled by the serpent and ate the fruit.
Man willfuly disobeyed God when he ate the fruit. He made a choice to eat the fruit and die with the woman rather than be left alone with the animals again.
"John 5:39 (KJS) Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me."