What gets to me the most is when people say that you should tolerate and respect people's religion. That is what a Imam in my country said and most people seemed to agree with. That is what even many of the moderate "muslims" say, though i'm not sure I would call them muslims. It's like calling yourself the Ku Klux Klan but then claiming that you stand for multiculuralism and racial tolerance and then blame people for associating you with values traditionally associated with the group. The terrorists aren't the Islamic heretics, moderate muslims are, pretty much the same can be said for the fanatical christian like wesboro baptist church and moderate christians. Moderate muslims are a lot like the moderate christians, they don’t go to mosques and they don’t really read the Quran, the terrorists do and they follow it. Muslims who are tolerant of nonbelievers, women's rights etc are quite clearly going agains't the teachings of Islam. I never get why it's so prevelant that the people who disagree with so many things in a belief system are still determined to call themselves the member of the given belief system.
Anyway, you should be able to ciritizise and ridicule bad ideas and "islam is the mother lode of bad ideas" though I would add other religions to the pile. If I know that someone is a christian or a muslim in my mind he is kind of a piece of shit and I find it hard to have much respect for that person. Religion is nothing like race or ethnicity which decides the color of your skin and perhaps the shape of your nose and the size of your dick, superficial shit that doesn't matter. Religion is something completely different, it's a system of beliefs and values aka the stuff that defines a person. And if your values are something so evil as what you find in the Quaran why the hell should I have any respect for you, should I even tolerate you? Tolerating extreme intolerance and hate can be dangerous.