The whole idea of "original sin" is intended to trick mankind into falling under the control of some external leader. Plato was likely the author of the whole idea, which basically states that man needs a bunch of pointless rules to live by. And the religious leaders cash in on it, using it to usurp sacrifices "in the name of a higher cause".
All it does is stifles people's enjoyment of normal life. The animals all get sick and die (if they don't get eaten or suffer other hardship and die), and yet they aren't born in sin. So that throws the theory of man's growing old or sick and dying as the result of original sin right out the window. Indeed, the animals have no taboos on normal sex drives (like fornication, adultery, homosexuality, and the like--some species of apes even have the youth initiate sex with older members of the species without undue aftereffects). And the animals do not waste portions of their time and money going to church, tithing, donating to the Worldwide Pedophile Defense Fund (hey, the animals don't silence the young that initiate the sex acts, or coerce them into submitting either), or guilt for stupid things.
In fact, taking that fruit was not such a horrible act after all. What would have happened had they not eaten it? Would some other being been deprived? Or, would it have merely dropped off the tree and rotted, having gone to waste? The real issue is that Jehovah wanted mankind to remain forever bicameral, obeying Him without any regard for the consequences. Whatever rules He would have set up would have been for His own benefits at the expense of His subjects. Satan thus set us free from some of the most ridiculous laws that we can't even begin to imagine. As such, Satan did not sin--Jehovah did!