I also find it just as hard to acccept that nothing went wrong either.
I'll toss in a decidely non christian and most definitely non literalist understanding of the eating of the fruit of the tree of knowledge of good and evil.
Humans did at some point develop reflexive self awareness of themselves and with this a consciousness of their actions including judgements of themselves and their actions. This self reflexive consciousness resulted in an ego which feels itself to be a separate and independent entity.
With this comes feelings of aloneness, uncertainty, fears, guilt the whole "burden" of self consciousness. Feeling separate from All That Is (can be referenced as God) humans began to suffer from their separation. And as humans are wont to do this suffering felt like a punishment, and if punished they must have been guilty of something that brought about the separation. Feeling out of harmony with God's will the crime then is disobediance.
Living in Eden is living in a state of oneness with All That Is, with the Universe, or God. The story of Adam and Eve and the Garden of Eden is a mythical expression of the understanding of the loss when self consciousness which includes the judgements of good and evil comes into being.
The fall is a falling into individual consciousness, identification with the organism as a delimited entity, a falling into the dream of being separate and suffering from that sense of separation or sin.
This is an extremely condensed capsule overview of my take on the story. On the one hand nothing went wrong. All That Is has manifested this. On the other hand it feels wrong and disjointed and consciousness caught in the dream finds the isolation to be at times a nightmare and seeks release, or return to knowing that it and the Whole are one.
lfen