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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.

Well you're right about that, but consider the context in which I wrote that which you quoted and replied to. I wasn't just saying that out of the blue - what I wrote was a direct response to someone who had written ".... theists conceive of a metaphysical that intersects the physical...."
A theist is simply a believer, so I was replying that your average believer doesn't concern himself about such things, i.e., the "metaphysical intersecting the physical"

many just believe, period, and don't ever even think about exactly why they believe, don't ever question it, just go with it as if it were a given fact.

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