God does not force them to happen against our free will; rather He predetermines that they will occur through our free will. Or, to put it minimally, God does not have to make these events occur; He can see them occur—from His eternal vantage point.
A person standing on top of a building foreseeing a collision (between [Page 95] two cars that cannot see each other around the corner) does not cause the crash. Likewise, God, who can by His omniscience foresee what we will freely do, need not cause us to do it. And even if He is the ultimate cause of all things, He is not the immediate cause of them. Free moral agents are the immediate cause of all free actions. God (the primary cause) produced the fact of freedom, and free agents (secondary causes), by God’s grace, produce the acts of freedom
Further, one and the same event can be both determined and yet free with no contradiction. For example, when one watches a recording of a televised game, it is already determined; nothing can be changed. It will turn out exactly the same, score and all, no matter how many times one watches it. Yet when the game was played, each and every person played according to his or her own free will. No one was forced to do anything. Thus, one and the same events were both determined and yet free
To the objection that this is so because we are looking back on the game, the theist could reply, “God in His omniscience looks forward with an even greater certainty than we look backward.”
The God of orthodox theology is eternal, not temporal. Therefore, He does not really look forward to the future; He simply looks downward on it, since it is present to Him in His eternal now (as the great I AM of Ex. 3:14). To illustrate, a person in a cave can look out the tunnel and see only one train car going by at a time—the present one. He cannot see the one already past or the one yet to come. But the person on the top of that mountain can see all of them at the same time. Likewise, God can see past, present, and future all in His eternal present (the now). He sees the future, not because it has already occurred, but because it preexists in Him as the eternal Cause of all that was, is, and will be.
If God is eternal, there is no problem with an event being determined in advance (and, thus, not being free), for then God is actively seeing in His eternal present what we are freely doing. He is not passively seeing the future (as though He had to wait on it to occur). He is not literally foreseeing anything. It is only called foreseeing and predetermining from our standpoint in time, not from God’s vantage point in eternity.
In point of fact, God knows the future not because He is looking down or ahead; He is simply looking within Himself, for all effects preexist in their cause, and God is the Cause of all things, including the future. Hence, God is seeing them in His eternal nature, before they ever occur, with the same certainty as if they had already occurred (see Aquinas, ST, 1a.14.6–9). There is no contradiction between God’s predestination and our free will.
End of quote
And that's that. Except to say of course that man's inability to comprehend events has never to human knowledge meant that such events are not real.
To answer Sue's questions - well two anyway. Why do I need God? Without God nothing would exist and nothing could continue to exist - He is both creator and current sustainer of all things. No God = no thing.
Then I need God for my own salvation so that my eternity is not spent in the stripey hole. Why does God need me? He doesn't. He wants me - that's different. Sounds like fun eh Gob? He wants Gob and Sue 2 but that old free will thing probably kicks in just about at that point (just as He knew it would. I'm not sure about Gob; maybe God predetermined that one the old fashioned way

Love
Meade