You haven't heard of the five pillars of atheism?What is a fundamental atheist? Lol.
Here is a link to an article:
Atheist fundamentalism - RationalWiki
I would say it is atheists who are invested in their beliefs? In the same way that a fundamentalist Christian wants to believe certain things to maintain group membership, a fundamentalist atheist wants to believe certain things. So in both cases, it is hard to get the person to soften or change his/her beliefs.
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