Well, this is what I am trying to wrap my head around.
Evil doesn't seem to just creep in from outer space (or maybe it does ) if there is no PROVISION for it in a first place. I agree that satan/serpent is just one of the factors for A&E sinning.
Which begs the question: what was the purpose of evil (disobedience, imperfection - call it what you want) in a perfect universe, created by a perfect thing, filled with other perfect things. And the realization that evil didn't just come out of nowhere.
Perfection does not create imperfection, as by its very own definition, there is not even the slightest bit of imperfection in perfection.
Ask a creationist and they will tell you that "something doesn't come out of nothing".
Going back to God allmighty (since he is the alpha and omega, to use a well known definition), imperfection has to be an intrinsic part of him, or else it wouldn't exist.
You can't have it both ways.