So, you contend that adam and eve had the intellect, reasoning and self awareness of adults yet were incapable of evil thoughts, as well as not knowing any. They would be incapable of wanting to fulfil sexual desire when the other doesn't want to, rather than choosing not to. Neither could invent the evil of rape. The free will to choose between good and evil yet incapable of inventing evil. An ideal yet to be described by any philospher or storyteller and certainly not me. The worker's paradise of Marxism required enforcement and propaganda. Even in the fake, programmed utopia of Brave New World, Bernard invents evil by discrediting the Director of Hatcheries. Forgive me when I say intellect without capacity for evil is a daft idea.
Besides, if it was that important that mankind not know evil, why wasn't the tree better hidden or guarded? Sooner or later, someone curious will try it. Sounds like entrapment to me. Or was the retrofitted suffering and pulling legs of serpents a necessary part of creating free will?