croak
Trickster
I suppose it could happen. Then again, there are plenty of people that have used their real names. And with the Internet, Muslims themselves have felt emboldened, and share opinions that might be seen as unorthodox or heretical.Not publically, and not in a Muslim country. That's why Mr. Ibn Warraq [thanks croak for the education] uses a pseudonym. He is afraid of being murdered. You do admit that happens to critics of Islam?
A few examples of Muslims in Muslim (at least Muslim-majority) countries can be found in, of all places, an article on FaithFreedom.org: What is the Qur’an? | Faithfreedom.org I don't think the author would have missed a chance to mention if any of those listed were murdered, so I think it's safe to say that simply being a critic does not mean you'll be murdered.
Assuming revealing your name automatically meant a death wish, you practically have a hit list right here: List of critics of Islam - Wikipedia, the free encyclopedia