i grew up in a religious fundamentalist culture. While Webster gave Christianity ownership of the label "fundamentalist," i've learned that Webster might have been ethnocentric. For instance, there are fundamentalist Muslims. i think fundamentalism is an absolutist position, i've met what to me are fundamentalist atheists even. The more i've looked at it, the more it seems to me that fundamentalism is mostly an absolutist stance, where one is convinced they have arrived at the 'truth' of a matter, with no room for doubt. It can be particularly strong when one is convinced they have 'God" as a source.
i see absolutists everywhere, like in discussion forums here at The Cage. It's not all that hard of a mode to slip into, i find myself having to edit stuff i write with qualifiers like: "i think," or "i believe," reminding myself i could be wrong. Absolutists make an unequivocal comment and if someone posses a different idea, they often often pounce explaining how and why that person is wrong, often with a superior air. i've never once seen what looks like an 'absolutist,' back down, or sincerely admit they might or could be wrong. i think that an absolutist looks for security in being 'right,' more than in content, and to admit being wrong makes them feel insecure. They seek refuge in 'the truth,' vs the pursuit of reality.
i don't think it's possible to engage an absolutist. Their only goal is to teach or convince others of the 'truth' they hold to be self evident. Convincing another is self affirming. Not talking about people who are confident or who understand debate. i think confident people can easily admit when wrong because they are open to seeing. i find that people who "know" they are right do not listen or hear other views on the topic they "know" about. They don't need to listen, they already know, so trying to engage them is an exercise in futility.
i don't try to dialogue with an absolutist. After years of trying, it seems to only poke the bear. If i encounter an absolutist in forum, i don't ignore them. i read and consider what they write, but i don't try to engage with someone who is only there to regale with their wisdom. i don't try and engage someone who is wired with a vest bomb.