birdie, do you know of any document/book which goes through contradictions, particularly offensive (in modern terms) strictures and/or descriptions/acceptance of practice, etc., etc. quoting chapter and verse in the Koran and, for that matter, the Bible too - I would be really interested in something of that nature because I have never had the time or the patience to myself go through these scriptures.
We shouldn't be too surprised that believers are less than keen on objective scrutiny of the "holy word", after all we see direct equivalents in the secular world. So often people talk of the "best" in some way when they are comparing something they are committed to or otherwise identify with. Most people either seek security in the familiar or else align themselves with something they find believably "superior" in some way. Politicians and advertisers know this very well and heavily play on it: the former use fear induction as a means of gathering support and in a way advertisers do the same by using the discomfort they are able to induce within a large part of the population who want to feel pride in being up-to-date in all sorts of ways ("don't fall behind").
There are plenty of examples where people will suggest their country is the "best" in one way or other, even when that has no basis in fact because there are statistics and other information to prove the assertion wrong (I once pointed out one such claim being wildly erroneous, the person's retort being to in effect call me an annoying know-it-all). Wanting to be "best" on the moral/spiritual plane is important to lots of people and it is entirely understandable that religious believers are very touchy (and even illogical/irrational) when it comes to shaking the foundations of something which has (in most cases) been at the core of their identity as far back as they can remember. The most vulnerable are the ones who are the most dogmatic because their commitment is so often quite blind - maybe because in their clinging to this form of security they deliberately avoid questioning for fear of finding cracks in the pillars.