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The problem with that is, most religious people - at least the ones I personally know, couldn't care less about metaphysical this intersecting physical that...

They believe because they were told to believe, raised to believe, and told that to doubt is to put one's soul in jeopardy.
To think about it all too much is skirting dangerously close to damning oneself to an eternity of fire and brimstone (in spite of the fact the Bible clearly says that Hell is only for Satan and his evil minions, but that's a whole separate argument altogether), so thinking is discouraged.

That's simple specialization.  Most people in a given society won't be philosophers or prophets, and so the masses rely on the best minds to sort these things out, just as we expect our doctors or lawyers to know more about those subjects than the average person.  You shouldn't assume that people wouldn't question these things if more felt qualified to do so, nor should you take for a fool every farmer or soldier throughout history for happily carrying on their forefathers' faith simply because they had more important things to do than ask unanswerable questions.

Many theists are quite aware that God can't be (dis)proved but don't see themselves as the person to tackle that problem.