Well, I only read the last couple pages, but it seems to me like Hax is trying to say "the people who are fanatical and devout and live the religion are not the real muslims, the real muslims are the ones who follow a more secularized faith and aren't as religious". That seems weirdly backwards, but besides the point. There is no need to make a blanket statement in the firstplace (especially when, as he pointed out, there's no single thing that we could call islam). And since most people intuitively know that some muslims are fanatical and many aren't, quoting some sort of statistics would settle that as far as it can be settled, I assume.