They tend to do that because they're sick and tired of creationist apologetics running the tired old "god of the gaps" argument by them. That is a creationist argument, not anything the atheists came up with. When atheists start acting analogously to genuine fundamentalists of any stripe, then you may consider that we deserve the title "fundamentalists." However, since that analogy is false and wrong, it should be dropped.
Hmmm, lessee. Insistence upon being correct, insistence that theirs is the only way, denigration of competing beliefs, frequent reference to empirical texts that only they hold sacred, prediction of dire circumstances if their way is not universally adopted, general lack of a sense of humor...ah, you're so right! Nothing fundamentalist there. Don't know how I might've been misled. Carry on.
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