I think a lot of people here dont know what 'fundamentalist' means. I suggest you look the word up before calling me one.
Your dogmatic approach to atheism is akin to a fundamentalist religious belief. Whilst not specifically correct one of the beauties of the english language is it's scope to go outside of the specific definitions of words and use them in new ways. I would certainly not be the first to use the term in such a way and in this case seems to be quite apt. In short you are becoming like the very worst examples of those you so profess to despise.