In your conreligions, are there any fundamentalist movements?
In my planned future history of Adpihi's religion (or religions?*), the notion of "fundamentalism" or its opposite, probably doesn't really apply.
However one of the major events of history was the rise and eventual defeat of an intolerant exclusionist movement that thought their version of the world religion was the only correct one, and all other versions were wrong or bad or evil or something like that.
Depending what you mean, all of Adpihi's religion(s) is(are) "fundamentalist", in the sense that few Adpihi can conceive of someone not having a religion, or of it being less than pervasively important to them.
OTOH during almost all of their history almost all of them observed a very tolerant and individual religion. A strict "splitter's" classification could say that every believer, or perhaps every nuclear family, had/has its own religion (though they're all variants of the world religion). But almost all of them have almost always assumed that someone else's relationship to their God might be different, or that their obligations to their God might be different.
Anyway: There was a very trouble-making sect. Depending on what you mean by "fundamentalist" maybe they were fundamentalist.