"I'm not sure that Islam is the best set of doctrines we have to live by." "Oh, so you're saying that all Muslims are terrorists?"
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It's a really twisted situation because it's ok to criticize someone for a bad idea, but it's not ok to criticize someone for their race.
So be very careful with "all muslims" statements. People might misunderstand you because they equate being muslim with race, not religion.