This blogger has recently been involved with extensive blog comment conversation with two Fundamental Christians. As anyone who has expressed opinions contrary to what these folks believe knows, any discussion with people of this mindset can be frustrating. Why is that so?
There is a concept in legal and philosophical thought called defeasibity, which means that an idea can be overturned or nullified if countervailing evidence becomes known. The opposite of this is called incorrigibility, which is being unable to be corrected or reformed.
Matt McCormick has posted a detailed article on this vexing situation. All people who have a worldview different than a Fundamentalist of any sort needs to keep the concepts of defeasibility and incorrigibility in mind to know with what you are dealing.