There is more than one kind of fundamentalism, as Terry Eagleton points out in this essay in the Guardian. Fundamentalism is not so much religious as it is textual, which means it covers a lot of ground.
… Read the restFundamentalists are those who believe that our linguistic currency is trustworthy only if it is backed by the gold standard of the Word of Words. They see God as copperfastening human meaning. Fundamentalism means sticking strictly to the script, which in turn means being deeply fearful of the improvised, ambiguous or indeterminate…Since writing is meaning that can be handled by anybody, any time, it is always profane and promiscuous. Meaning that has been written down is bound to be unhygienic…Fundamentalism is the paranoid