claiming that foreknowledge means free will doesn't exist is preposterous.
You can't have both, though. Let's say that, for the sake of argument, the Christian god exists. He knew, before the creation of the universe, that we'd be having this conversation on gamefaqs. He knew that I would be eating subway, right now. He knows what I'm going to be doing tomorrow at 3:30 PM.
If this is true, then that's predetermined. Predestined. You can't have those, AND free will.
What God can see and what you do are two separate concepts.
but if someone is capable of knowing exactly how something will turn out means that there's only one possible outcome. there can't be alternate outcomes or else god wouldn't be sure which path you'd take, in which case he doesn't know everything
Why can't there be multiple outcomes in which God sees them all? He can be aware of all futures outside of "this one". That's part of how he makes choices.