Since it is not obviousthat one can rid oneself of all constraints in realistic models, let us examinethe argument that time travel is implausible, and we should think it unlikelyto exist in our world, in so far as it implies such constraints. The argumentgoes something like the following. In order to satisfy such constraints oneneeds some pre-established divine harmony between the global (time travel)structure of space-time and the distribution of particles and fields onspace-like surfaces in it. But it is not plausible that the actual world, orany world even remotely like ours, is constructed with divine harmony as partof the plan. In fact, one might argue, we have empirical evidence thatconditions in any spatial region can vary quite arbitrarily. So we haveevidence that such constraints, whatever they are, do not in fact exist in ourworld. So we have evidence that there are no closed time-like lines in ourworld or one remotely like it.
http://plato.stanford.edu/entries/time-travel-phys/#8
What’s striking aboutthis objection is the admission that the possibility or impossibility oftime-travel isn’t theologically value-free. All other things being equal,time-travel might be possible in a theistic universe, but impossible in anatheistic universe.
Of course, that, ofitself, doesn’t resolve other issues concerning the logical, physical, ormetaphysical possibility of time-travel. But it does illustrate the fact thatbringing God into the picture or leaving God out of the picture is agame-changer. What is unrealistic in an atheistic universe may be realistic in a theistic universe.
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