> I think it is fairly obvious to Dave that we do not have a logical and rational answer for him. I know that I could never provide one that would be completely convincing either. This is because my belief has no roots in logic or rationality.

Whether this is true of your belief or no, this is not true of mine. What I tried to explain to Dave, failing to do so until I changed tacks, is that my faith *is* logical and rational, just not necessarily immediately intuitive, completely communicatable (though some of it is), and that logic and reason are not the ONLY tools that must be used.