To save whoever reads this a click, it's a link to an irrelevant article about the problems and ethics of measuring accuracy of commonly held beliefs based in prejudice along racial, gender and similar lines. It's presented instead of evidence of the accuracy of the earlier generalisation, because such evidence does not exist.
Not quite! I presented no evidence that my generalization was correct, but you didn't say that my generalization was incorrect, you said that "to generalise" a large number of people is unsound, which is refuted by studies of a phenomenon called stereotype accuracy. You can argue that this stereotype of Muslims is wrong if you like (or that there is no such stereotype widely held), but that's a different conversation.
I don't get the feeling that you're arguing in good faith though, so I'll bid adieu now!