Along with knowing everything that is, God also knows all things possible. The knowledge of what could have been or could be is proof that foreknowledge is not causative. It also proves mans ability to choose. For example: God foreknew that Adam would choose to disobey and that the Fall would take place, and He permitted it to happen, but He did not cause it. Free actions do not take place because they are foreseen, but they are foreseen because they will take place. Unless of course you believe as John Calvin, who has been quoted as saying that God predestined the fall of Adam.
Again they object: were they not previously predestined by Gods ordinance to that corruption which is now claimed as the cause of condemnation? When, therefore, they perish in their corruption, they but pay the penalties of that misery in which Adam fell by the predestination of God, and dragged his posterity headlong after him. Is he not, then, unjust who so cruelly deludes his creatures? Of course, I admit that in this miserable condition wherein men are now bound, all of Adams children have fallen by Gods will. And this is what I said to begin with, that we must always at last return to the sole decision of Gods will, the cause of which is hidden in him. (Calvins Institutes of the Christian Religion, 3:23.4)
Instead, Scripture reveals the will of God.
Genesis 2:16-17
And the LORD God commanded the man, "You are free to eat from any tree in the garden; 17 but you must not eat from the tree of the knowledge of good and evil, for when you eat of it you will surely die."
Genesis 3:17
To Adam he said, "Because you listened to your wife and ate from the tree about which I commanded you, 'You must not eat of it,'
Scripture shows that God knows the consequences of all possible decisions, but He does not directly cause a person to make one decision over another. The choice is yours.
1 Samuel 23:9-12
When David learned that Saul was plotting against him, he said to Abiathar the priest, "Bring the ephod." 10 David said, "O LORD, God of Israel, your servant has heard definitely that Saul plans to come to Keilah and destroy the town on account of me. 11 Will the citizens of Keilah surrender me to him? Will Saul come down, as your servant has heard? O LORD, God of Israel, tell your servant." And the LORD said, "He will." 12 Again David asked, "Will the citizens of Keilah surrender me and my men to Saul?" And the LORD said, "They will."
In this instance God gives David insight into what would happen if David chose to stay in Keilah. Because David asked, God gave him inside information that would enable him to make a wise decision, but God did not make David choose one option over the other. The things that God said could have happened did not because David chose to leave.
Matthew11:21
Woe to you, Korazin! Woe to you, Bethsaida! If the miracles that were performed in you had been performed in Tyre and Sidon, they would have repented long ago in sackcloth and ashes.
Matthew 11:23
And you, Capernaum, will you be lifted up to the skies? No, you will go down to the depths. If the miracles that were performed in you had been performed in Sodom, it would have remained to this day.
Isaiah 48:18-19
If only you had paid attention to my commands, your peace would have been like a river, your righteousness like the waves of the sea. 19 Your descendants would have been like the sand, your children like its numberless grains; their name would never be cut off nor destroyed from before me.
Again, God has knowledge of the possible as well as the actual and He certainly foreknows the future.