Criticism of religion (including Islam) is a criticism of ideas
I found the following reader comment at a Salon.com article :
Criticism of religion is a criticism of ideas. Religion is not an indelible attribute like skin color or sexual orientation. At some point a person chooses to accept a set of ideas. And some of these ideas are bad. It is perfectly valid for a person to say, “I do not want people who hold these bad ideas living in my community.” That is not bigotry. It is critical thinking.
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Commenter Gilbert Ratchet has the correct answer:
You’re wrong, of course. Criticism of CHRISTIANITY, being the historic religion of the majority of Americans, is criticism of an idea and needs to be encouraged. Criticism of anything else (e.g. Judaism, Islam, Buddhism, Sikhism, Confucianism, Jainism, or Hinduism), being minority faiths in the US, is criticism of an identity and absolutely forbidden.