Oh, I'm not denying His existence; I'm agnostic, not Atheist. But if God does exist, He has a lot to answer for. Theologically speaking, a God who can and does miraculously intervene is still responsible for those moments when He chooses not to.
You demand the answers first, it might not be Adam's butt you want to kick immediately thereafter. I would think at the very least, there's a certain serpent that has a lot to answer for as well.
But consider the theological implications:
When God created A&E, he deliberately created them with no knowledge of good or evil -- to wit, no moral sense. In effect, A&E were no different from any other animal.
Not knowing good or evil mean that they were incapable of recognizing the consequence of their actions, which means they could not have understood why it was so important to obey God's instruction not to eat of the Tree of Knowledge. When God said, "If you eat of it, that day you shall surely die," He might as well have been giving instructions to a cat.
God left his perfectly innocent and naive creations unsupervised in a place that contained 1: the means to bring all of creation crashing down into chaos, and 2: an utterly malevolent creature just looking to start trouble.
We all could've seen where that was going...