My personal opinion is that if a rational theist(?) showed up, they would admit outright that their faith is not based on provable evidence, but on a certainty that they feel "inside" that the universe is governed by the divine, and that the bible is the inspired, not literal, word of god, simply because it makes ultimate sense to them. They 'feel' the spirit inside them. I know many devout christians like this. Some are avid evolutionists and science enthusiasts.
I think Lori7 may be one of these?
The rest, by default, are irrational and will spout the same crap that the current crop of theists here spout. And all you can ultimately do with them is tell them how stupid they are and drive them away.
Be gone evil theists! In the name of DARWIN, I command thee!