Maybe they should abide by their beliefs in their responses. "Keep an open mind" can only apply to certain things, not "a radiator cannot weigh more than 300 pounds" Oh my god just thinking of the guy I'm basing this on makes me want to believe everyone is this way.
They like to go to extremes and punish anyone that doesn't abide by every thing that the bible says to do, not to do and what flavor of ice cream they should eat. They believe that whoever follows their own rules in the way they want to live life, they will go to hell.
Sane person: If Americans descended from Europeans, how come there are still Europeans around?
Normally they don't believe due to massive misunderstanding's and lack of common sense
Often misdefined as "fanatic". A person can be a fanatic and a fundamentalist, or only a fundamentalist, or only a fanatic, or neither.
The action taken by a fundamentalist depends on the nature of their belief. It can be a personal action which affects no one else, or an action which affects tens of thousands of others, or something in between. Can be positive or negative.
Can apply to any religion or ideology, also of a method of or pertaining to fundamentals.
"islaamic fundamentalist" - generally stereotyped as jihaadist. Not necessarily so.
"christian fundamentalist" - generally stereotyped as bigoted and in-your-face. Again, not necessarily so.
And a correct but uncommon use:
Music teacher: "You need to learn your instrument's fundamentals before you can play solos."
Kid: "Teacher is a fundamentalist."