Assuming the garden of Eden is true

[Muffled]

I think it might be like a road sign that says, "do not enter". I think that is a good thing to know.

I believe it would be like eating poison mushrooms. One would never contemplate doing so or God would simply prohibit it.

 

[Muffled]

That is correct, imo. There is no textual evidence for the opinion that to know bad means to know sin.

I believe at this point all they would have known was that they displeased God and were punished for it. When that started to be called sin I never researched but I suspect it was after the law was written.