I came up in this through my debate with a theist (ok ok... I haven't been around all that long in the scope of atheism, but whether the idea's there or not, I did think of it. Don't jump down my throat)
My loophole in the Biblical structure is really quite short. I haven't found the theist to counter it yet. Perhaps it will take an atheist to protect theism? lol
You: tell me why evil exists
They say: Because evil is necessary for us to percieve good
You say: Well why didn't God create man to be able to percieve good without evil if he had the ability to?
Them (if they have an ounce of experience in this topic): Because good can not exist without evil. It is like light and dark. Dark is the absence of light.
You: If good and evil must be equal and opposite, then does the light control the dark? God and Satan, therefore, must be equal and opposite forces. Therefore, God is no omnipotent.
Furthermore, God could not create "free will" in Satan if he was omnibenevolent because ultimate good has not the capacity to create evil. Also, if good and evil are equal and opposite forces, Satan must have been around exactly as long as God has; no more no less.
So that's my thought. Could you check my argument for loopholes please? Thanks.