I think it's meant as an application of a principle, that if you can extrapolate from one particularly troublesome sect of a religion to apply to all, then it works the same way across different religions. It is notable that the most troublesome sect in Christianity is all show and no go. They're not tossing gays off of buildings. They're just standing around exercising their freedom of speech, holding up signs proclaiming their god hates fags.
Right, I'm not comparing the crimes... I'm providing an example to your histogram comment... Where we look at the extremes and apply those standards to the entire bell.