If Evil was made by the Fall, whenceforth was Eve tempted?
That sums it up right there.
Some Christians say that evil did not exist until the Fall - that all suffering and sin came about as a result of Eve's choice to disobey God. That sounds reasonable, right?
Imagine a world where there is no sin. Everything is perfect. The sun is shining, the birds are singing, and the lion is gettin' cuddly with that lamb over there (but not too cuddly - fornication is a sin). You have absolutely nothing to worry about.
In comes a snake. Now, this is not an ordinary, benevolent snake. It's a nasty snake, here to tear you away from your beautiful world. How? By lying to you.
By lying to you.
Somehow, inexplicably, in this world where sin and evil do not exist, a snake is about to lie to you. Not only that, but he is about to persuade you to disobey your Creator, by coercing you into eating a fruit that will give you the knowledge of good and evil.
The knowledge of good and evil.
In other words, sin and evil already exist.
Hold on, my inner Christian has a complaint. "Evil wasn't created by the fall," she says. "It was brought to Earth by the fall."
Whoops, sorry. Almost made a straw man there - that would have been embarrassing.
If evil was there all along, then, where was it before it came to Earth? In Heaven? God hadn't even created Heaven until the third day or so; it must have been lurking in the cosmos somewhere. And how did it get there? God can't have created it. God is omnibenevolent (all-loving), so he wouldn't have created anything that could possibly harm his creations.
The working hypothesis: In the beginning, God and evil existed. God created the world, created animals, created man, created the garden, created animals, and created man. And it was good. Then evil snuck into the garden, infested the snake, and messed everything up.
Wait a minute...
God is omniscient (all-seeing), so he should have seen that coming. But he did nothing to stop it, so he must have planned it or wanted it to happen. If he hadn't wanted it to happen, he could have stopped it. After all, he is omnipotent (all-powerful). Or did he not see it? Then he must not have been omniscient.