Creation and the fall: Dogmatism at it's finest

The first Bible story is about God speaking the world into existence.  Part of that story is how the world was ruined.  So let us skip the creation itself.  God has put the tree of the knowledge of good and evil in the garden.  Why did God put the tree there?  Good question, I have no answer.  Somehow, the devil in the form of a serpent was also in the garden.  Why, with all of the earth and better yet, with all the universe to bind the devil in did he pick this planet in that garden?  Another question without an answer.  

So when we assume all of this, it is then obvious that evil did not come into the world when Adam and Eve ate the fruit, but when the epitome of evil arrived here.  Shouldn't it be then that the world was tainted?

God commanded Adam and Eve, who at this point have no clue about good and evil to follow a command.  This one command, don't eat that fruit...  don't even touch it...  I'd prefer you don't even look at it...  on second thought, don't even think about it.  Adam and Eve, being innocent and curious creatures naturally gravitated toward the fruit.

The only thing which stands between them and the fruit is God's threat.  One which seems unfounded without an innate sense of morality.  God never told them that to eat the fruit is immoral, and if he did they'd need to have a foundational knowledge of morality.  That defeats the purpose.

So with a dogmatic command to heed, the pair were blissfully ignorant of any moral issue.  The serpent presumably knew this and exploited it to it's fullest.  He made a counter-offer to God's threat and Adam and Eve took it.  They ate the fruit, breaking only an unfounded command.  After that all hell (all too literally) broke loose on the earth and the omnescient God who created and planned it all was dismayed.