I should clarify: I think Islam as a whole is dangerous because it teaches a mode of thinking in which it is ok to base your reasoning on a dogmatic presupposition. This is extremely corrosive to rational thought. But I don't think this is fundamentally different from presuppositions that are typically taken up when you start identifying with a political party. It's not by accident that people who openly identify with a political party share almost all the opinions that are typically associated with that party. This is not based on rational thinking, it's tribalism.