About the "kicked-out-of-the-garden-of-Eden-conundrum", I have a simple hypothesis: assuming what happened is true and that there was such a God, and the fruit had whatever free-will-superpower-granting properties, my observation was that Mr. God wanted to give people free will (assuming they were nothing but deterministic machines before that, that would always act in the same specific way whenever they were given some input, and free will adds some kind of randomness to the process), BUT, he still wanted everyone to feel guilty about it so he could still control them after the little experiment.
Or they were not meant to have it yet, but eventually they were.
Now I would like to tie this in to your previous post. I don't believe good and evil are opposites, nor does good require evil(On the contrary, evil requires good). I think of evil as more of a perversion; Good things taken to a time, place, degree, etc that no longer gives the benefits of goodness, to the point where we don't recognize goodness. Rape has sex as it's base, which at the right time, place, partner, degree, etch can be a good thing. Hitler had patriotism as it's base, taken to a limit where it was no longer just somebody trying to save their country but somebody trying to conqueror.
Thus in theory this 'fruit' could be something that the original ancestors could have eventually received, but they were mature enough for it.
Of course, I have made some assumptions here that require explaining. However, those are for another post. Heck, I don't think I'm really up to explaining all I believe in in reference to this thread.