This reminds me of my roommates philosophy assignment. He had to agree/disagree with this statement and then argue for or against it. I don't know the exact wording he used, but it went something like this:
Imagine an omnipotent being. This being has full knowledge of all of the laws of the universe and knew the exact position of every atom, subatomic particle, etc before the big bang occurred. If you agree that all things of the universe must follow certain laws without exception, then it would make sense to believe that this being would know how the universe unfolds after the big bang. He would know precisely where everything is located at any given time.
Follow this to the creation of Earth. As the atoms combined to form molecules, this being knew beforehand that humans would come into existence. Since living organisms react through the manipulation of chemicals in their body and the outside environment is obviously following a rule set, they aren't necessarily free from the initial rules. Thus, every event of a persons life can be predicted. In other words, people do not have free will.
Of course that's taking the whole predetermination thing to a different level. But my roommate couldn't find a way to argue against it (logically, since he agreed with the progression of the ideas). I probably butchered to original statement.