For a somewhat broader term, we could could call them fundagelicals or "Islamic fundagelicals" when we need to distinguish them from the vanilla version.
- Jake If you only spend 20 minutes of the rest of your life on economics, go spend them here.
Somewhere, I read an article to the effect that the term "fundamentalist" was not applicable to Islam because the history of disputatious biblical exegesis to which it refers does not exist in Islam. I have no idea if that claim makes sense.
However, like "evangelical" - and to an even greater extent - it has in common parlance become a catch-all derogatory term for religious wingnuts. And I don't think it's worth the bother to try to salvage the original meaning of the word (at least not outside scholarly discourse).