According to your belief system, which is perfectly legitimate for you, but not necessarily what everyone else believes...
Right though you are HD, that's not the best argument to take in a thread like this, as that response can be ascribed to absolutely any post on this ultimately subjective, metaphysical argument. It becomes the religious equivalent of "I know you are, but what am I?", perhaps a more antagonistic approach would be appropriate, given the circumstances.
What has been highlighted here is the issue of determinism, which is not entirely the domain of religion. For example, I am an unrepentant dyed-in-the-wool atheist, and yet I hold the logic of determinsim as something close to fact. To explain:
Fact: Everything that happened in our past determines what happens in the future.
Explanation: It's simple cause and effect, we would not be here today if the past had not occured in the exact same sequence that it did. Not in the same manner at least.
Fact: The past, by very nature has already occured.
Corollary: Thus, our future has already been determined.
Corollary: Thus, there is no question of will, free or otherwise. What will happen, will happen, regardless of our decisions given that we have effectively already made them.
Now, if one is religious and holds true the idea of an ominpotent, omniscient, omnibenevolent God, then this is even easier to hold true, given that the determination of the future can simply be "explained" by God's plan. Regardless, it doesn't matter, because this argument can not be shot down; with or without a God. (Actually, argument is not the best word to use, given the self-evidence of it. It would be like "arguing" that the sky is blue.)
Thus, HD, he is in fact right, although by no means do you have to believe it, and to put this into the overall context of the thread; this does not prove a God either way because it is not a determinative factor in the argument.