I'll play :-D
This is from the Westminster Confession, and I think it deals well with this-
[i]Our first parents, being seduced by the subtilty and temptation of Satan, sinned in eating the forbidden fruit.1 [b]This their sin God was pleased, according to his wise and holy counsel, to permit, having purposed to order it to his own glory.[/b]2
1. Gen. iii. 13; 2 Cor. xi. 3.
2. Rom. xi. 32.
By this sin they fell from their original righteousness and communion with God,1 and so became dead in sin,2 and wholly defiled in all the faculties and parts of soul and body.3
1. Gen. iii. 6–8; Eccles. vii. 29; Rom. iii. 23.
2. Gen. ii. 17; Eph. ii. 1; [Am. ed. Rom. v. 12].
3. Tit. i. 15; Gen. vi. 5; Jer. xvii. 9; Rom. iii. 10–19.
From this original corruption, whereby we are utterly indisposed, disabled, and made opposite to all good,1 and wholly inclined to all evil,2 do proceed all actual transgressions.3
1. Rom. v. 6; vii. 18; viii. 7; Col. i. 21; [Am. ed. John iii. 6].
2. Gen. vi. 5; viii. 21; Rom. iii. 10–12.
3. James i. 14, 15; Eph. ii. 2, 3; Matt. xv. 19.[/i]
So now we need to step back and understand that NOTHING happens in this world apart from God's allowing it to happen. God knew Satan would fall when He created him, and God knew that Satan would bring sin into mankind.
However, Christ and His crucifiction were part of God's plan before the foundation of the Earth. It is as if in God's mind all of His work was accomplished before anything was created.
If we say that God did not know that Satan would rebel, and bring sin into humanity, then we have an unbiblical god, and this is generally the slippery slope that goes the way of open theism.
We do not have the right to ever judge God based upon our sinful nature. Even we as Christians have a remaining old Adam that corrupts even the most spiritual things we do. So when we come to something like this, we must tread carefully.
Here are three facts that must be reckoned with-
1)God is holy
2)God is omnipotent
3)Sin exists
Better to just accept the fact that God allowed sin to come into the human race, but He is not the cause of it at all, Satan is.