Atheism or antitheism?

Some of us have wondered whether assigning the atheist label to the likes of Richard Dawkins, Sam Harris and Christopher Hitchens (whose first name means "bearer of Christ"!) is not, after all, inappropriate. Given that these gentlemen do not stop at simply disbelieving God but are actively opposed to such belief, might the label antitheist (which Blogger's spellcheck does not recognize) be more appropriate?