I think it's problematic to refer to Dawkins as a militant atheist.

The reason for calling him that way is that he hold a big talk in front of TED preaching militant atheism.

Now, it may sound as though I'm about to preach atheism, and I want to reassure you that that's not what I'm going to do. In an audience as sophisticated as this one, that would be preaching to the choir. No, what I want to urge upon you - instead what I want to urge upon you is militant atheism.