bustin98's thought about how thoughts are laid out reminds me of a theory I often think about, that of fate.
Since everything is merely a continuation or reaction to the state of things a moment before, things can't happen any other way. Another universe that has the exact same starting conditions (placement of energy, matter, direction of inertia, quantum particles, mood of God, etc.) can only have the exact same history. And this also means there can only be a specific present and future for any one universe.
You can't do something without a reason. Nothing happens out of the blue. Even if you do something now, relatively unusual and unsuspected, you'd probably be doing it out of spite of this theory, which itself is a reason, and it'd be confined to your mood, the electrons and chemical makeup of your brain this very instant. You can't think a thought or do an action that has no origin.
Being a Christian, it's hard to say that God isn't immune, but in a singular universe, it sure looks like He can't escape either. He's reacting to us as much as we react (or choose not to) react to Him, so the only escape from this theory for anybody is a multiverse of probabilities, but limiting the scope to a single universe with the quantum particles and God and all other things that could possibly affect it in a closed system, there's no way to escape a particular fate.
Of course, by limiting everything to a single frame of probability, I suppose the fallacy of this theory is the limited perspective - but that's what we all have. Or if we see the entire multiverse as a whole as a closed system, even that can't escape all the possibile destinies, as each universe is confined to its own.
In short, our future is inevitable (whether it co-exists with the present or not), and free will is an illusion.
