All of us grow up in particular realities - a home, family, a clan, a small town, a neighborhood. Depending upon how we're brought up, we are either deeply aware of the particular reading of reality into which we are born, or we are peripherally aware of it.
But today we become aware of other readings of the human experience very quickly because of the media and the speed with which people travel the planet.
I'm not altogether certain that a fundamentalism of necessity has to argue that it is the only reading of the human experience in order to stay alive.