What is fundamentalism?
Fundamentalism is more than just believing that one is in possession of the truth.,

It is the feeling that all other beliefs contrary (and the people that hold them) are aberrations and therefore must be disposed of - just like one would get rid of rotten tomatoes.

This also gives us a good distinction between dogma and fundamentalism.

A dogmatic person believes that they alone are right, but does not necessarily believe that other beliefs (or people) should be annihilated.

Whereas dogmatism can be purely intellectual, fundamentalism involves the will.

And that is what's so scary about it.

If we hear that so and so is dogmatic regarding a position opposed to our own, we may well just shrug our shoulders and say, "Oh, well - some people are just like that."

Whereas if we hear that someone is a fundamentalist regarding this same issue,an element of fear creeps in. We feel the need to put up our guard - to protect ourselves.

For the fundamentalist is much more likely to actually do something.