Omnipotent does not mean the ability to do anything. If I were omnipotent, I could walk through walls, I could not, however, both walk through a wall, and not walk through a wall at the same time.
Adam and Eve were not created as sinners. They were created with the ability to sin. There is a difference. Creating them with the ability to sin, is not against God's nature.
I realize that this is not my argument, but this is why I argue presuppositionaly rather than evidentially (in that case ontologically).Of course you would have to prove that God is an 'effect' to make your case, but you have a point.
The presuppositionalist says that God must exist for you to make sense even of causality. The preconditions of intelligibility require universal, abstract, invariant laws, which you cannot account for in your worldview. Feel free to try however.
There are no true agnostics. If an agnostic were consisten with his belief, he would go to church half the time.
Thanks for your good points.
Cheers