Freewill vs. predestination

First, does it really matter? i.e. Does the answer affect how you live your life? In both cases you must strive to serve God so I don't see how the answer matters.

Second, being able to see the future doesn't mean that one determines the future. If I see a car speeding toward a brick wall, I may be able to see what will happen in the future but that doesn't mean that I have any affect on the future. Just because God knows the future doesn't mean that he chose everything that will happen in it.

Do you see any problems with my arguments?