Note that this topic assumes the Bible is correct, that objective morality exists and that no being can create or conceive of something greater than itself; all of which are claims made by many christians.
A&E were perfect, right? Since they were perfect, they could only do what was right and were incorruptible.
Ate from the tree.
Covered themselves when they realized they were naked.
Hid from God when he came looking for them
Were punished for doing those things.
So, logically, God is not good, and therefore not perfect.
Here's another side of this argument, which is a short continuation of the "They:" list.
"Passed on" their flaw (which they had since they were created, since perfect beings cannot be corrupted).
Their flaw was there since their creation.
A&E were supposedly "God's perfect/best handiwork".
They were created with a flaw.
Therefore God cannot be perfect.