Faith and "Truth vs Utility"

[Sal]

I have often heard people say that the only good reason to believe something is if it is shown as likely to be true.  What if, however, you have a proposition for which it is impossible to show evidence either for or against it's truth value, but also for which there is great utility in adopting?  Is adopting this kind of proposition as if it's true just as good as (if not even better than) adopting a proposition that is demonstrably true?  If the proposition is "God exists", I think many theists might answer yes to the question, but I'm not sure.

(bold mine)

Then it would be unfalsifiable.

I can pretend something to be true, but in doing so, I've created a cognitive dissociation in doing so, defeating its utility. I don't see how thinking, something that's unfalsifiable, as true will make its utility desirable.

I can think there's a omnibenevolent god who will look after me while a tornado is heading my way trashing everything on its path. I can pretend the god will look after me, but that won't stop the tornado, now will it?

This is analogous to, on the odds end, that being thrown imaginary rocks at my head. You can shout any amount of how god will kill me, when anything to the effect doesn't happen, to the contrast of getting a real rock thrown at your head. If you see the rock coming, you're gonna duck, because we have falsifiable knowledge about the hardness of rocks.