It’s a disturbingly common accusation, made by accomodationist atheists and moderate religionists alike, that affirmative atheists (or New Atheists, as we are known, though all must agree we are nothing new) are “just like fundamentalists” in some way. This is generally taken as a wholesale refutation of everything we are saying, which is at best a hasty generalization and at worst guilt by association.
The usual response is to point out all the ways we are not like fundamentalists—we are open to rational persuasion, we value scientific discovery, we support free inquiry, and so on—and this is worth saying, since in all these respects we are clearly better than fundamentalists.
But in fact I think we do share something in common with fundamentalists, something beyond what we share with everyone else. (Obviously we are all human, we all feel joy and suffering, we all have biological and emotional needs, et cetera. We are more alike, my friends, than we are unalike.) There really is something about affirmative atheism that is closely akin to religion fundamentalism, something that probably frightens accomodationists and moderates.