Am I a bigot for believing that "two men being questioned over suspicious luggage" were certain to be muslim?

If you are a white, male American, and not a flaming liberal, yes, you are a bigot, by definition. Don't even bother defending yourself, just embrace bigotry and racism as the only identity that you will ever be allowed. If you don't like being a bigotted racist, become a flaming liberal and harshly criticise America, particularly 'white' America.