This post definitely has problems, but given the fairly interesting discussion it appears to have prompted, does not seem to deserve being in the minus-double digits.

I think the central point is that the practical value of faith is more of an empirical question than a logical one. The central problem, of course, is that for a real person to accept some propositions on faith requires a (likely significant) dent in their overall rationality. The question is not about the value of faith, but about the tradeoffs made to obtain it; a complexity which is not really addressed here, and which may prove so entwined as to be impossible to arrive at deliberately.

In other words, once you've chosen a certain amount of rationality, many paths of faith are closed to you. Conversely, once you've chosen a certain amount of faith, some levels of rationality are closed to you.