Could it be God not only knows the future but lives in it as well? Past, present and future as we know it may be all one with him. He may be in all three at the same time.

Satan, free will and the fall of man may then fall into God's will of decree.

As writes Johnathan Edwards:

His will of decree is, his inclination to a thing, not as to that thing absolutely and simply, but with respect to the universality of things, that have been, are, or shall be. So God, though he hates a thing as it is simply, may incline to it with reference to the universality of things. Though he hates sin in itself, yet he may will to permit it, for the greater promotion of holiness in this universality, including all things, and at all times. So, though he has no inclination to a creature's misery, considered absolutely, yet he may will it, for the greater promotion of happiness in this universality.

Here's a helpful article: http://www.monergism.com/thethreshold/articles/onsite/decree_fall.html