A little off topic, but since you mentioned it...
Since Satan tempted Eve with the following words: "For God knows that when you eat of it your eyes will be opened, and you will be like God, knowing good and evil." And she succumbed to that temptation, believing the fruit was "also desirable for gaining wisdom."
Therefore, would you consider Eve's desire to be "[her] own God" as evidence of her sinful nature?
If not, why not? If so, then from whom did Eve inherit her sinful nature?
The first man and woman had a free will nature and a behavioral problem. They did not have a nature problem.
To be more accurate, I should have said "the sinful nature of post-fallen man". I agree that Adam and Eve did not have a sinful nature but had volition. They had the capacity to be obedient...
So why did Adam and Eve choose to eat the fruit?? I do believe this was due to their desire to be their own God.