oomis-
You watch a movie. You know exactly what will happen, and when you watch a second time, that is exactly what happens. Your knowing, does not influence what the characters will choose to do.
That is l’havdil like Hashem’s Knowing what we will do.
Except once upon a time, before the movie was filmed, no one knew what would happen. And it was only at that point in time that the characters had free will. Now, when you’re watching the movie, their free will is obviously long gone.
This mashal doesn’t work, because once you think about it you’re always going to reach a point where you concede that a real awareness of the outcome cannot possibly coexist with a real power to change the outcome.