Traveler, in the case that God knows our future prior to us being created, even if we have a will that is separate from his creation, it all ends up the same. If he knows that in creating a being that he is creating Satan, then why go through with the creation, whether the will is created or just added as an ingredient in the creation?
It is like a cook knowing that a batch of flour is rancid, but still adds it into a recipe, already knowing before hand that it will spoil the end product. Just how would that meet his eternal purpose.
Second, if God knows the entire future from his very beginning (whatever that means), then he has no free will of his own, as his choices are already pre-determined. He cannot determine later whether he will create or not create, bless or curse, etc.
For LDS, God's work and glory is to bring about man's immortality and eternal life (Moses 1:39). Yet, if God has already pre-determined the outcome, why send us all through this path?
Rameumptom: A Holy Stand or Podium, where I can pontificate to my heart's delight.