About Eve and Adam´s condition, yes I would compare them with "toddlers" because they were naive and have no knowledge what right or wrong.
Hmm...who told you that Eve and Adam had no knowledge of good and evil?
Yes, God did gave them the knowledge of right and wrong in order to be able to make the "right" decision. Adam and Eve were given instructions from God, they knew was to not eat from the tree, and told them the consequences of doing so. Unfortunately they chose to disobey God on their own.
We all have this "terrible" feeling when we do something that isnt right so they knew what they were doing was wrong.