@Thomas,
Sorry, didn't see this right away. Many Christians probably do believe that they adhere to fundamentals--but i'm not going to discuss radical with you, since that was no part of what i've written. However, i suspect that Saab was referring to the commonly functional use of fundamentalist in regard to the religious, which has to do with those who are sufficiently convinced of the rectittude of their view to attempt to impose it on others. Saab is, of course, free to correct that if it is a misapprehension. It does seem to me, though, that Saab is now trying to dodge this question.
The question of whether or not there are atheists who can be described as fundamentalists, though, is not one which i would ever deny. I've known too many atheists who are eager to shove their world view down the throats of others, and who are only restrained by the awkwardness of finding a converstaional gambit. I usually think of them, however, as militant atheists.