Why do you think of Adam and Eve as having the minds of children? They were adults with intelligence. They were able to communicate. Were you there when God told them to not eat of the forbidden fruit of the tree? God didn't just pop up and tell them not to eat. They were in communication with each other. Adam and Eve knew that God was the creator of everything and has to be obeyed. He specifically told them what would happen if they disobeyed. It wasn't a question of knowing right from wrong. It was a question of obeying or suffering the consequences. I, personally, put my trust in the Bible and that God is good, loving, wise, merciful, and just. I will not second guess God. Also, I get all my thoughtless, extremely simplistic, and untenable view straight from the Bible. The church that I belong to is the one established by God and not men. I would refer you to 1 Cor 1: 26-28.
Please, submit your thoughtful, more complicated, and tenable view for everyone to consider.