[Zapmeister]

Originally posted by Tris:
If you know the starting conditions you can predict the events arising therefrom, and hence calculate a new set of "starting conditions" for the system at time X, where X is arbitraraly large.
...
Of course, if you mean "given the limits of human knowledge and understanding there is a 60% chance that this will happen", that makes more sense, but then "given the limits of human knowledge and understanding there is a 60% chance god exists" is also sensible.

You could be right - I certainly don't want to portray myself as an expert in this matter. However:

The first part of your post assumes that we have a determined, or "clockwork", universe in which all events, past and future, are set in stone. There is no agreement that this is in fact the case.

Even if it is, there are certain events (like the result of a dieroll) which are the net result of many small influences. It is these "statistical" results that are described by the theory of probability. When viewed in this light, it doesn't matter whether the result is determined or not.

Existential questions, as far as I can see, are not statistical in nature, and so cannot be addressed with the theory of probability.