No, they aren't. Many of the "reformed" sects are the worst ones. All those fundamentalist Christians aren't part of the old Roman Catholic church (or any offshoots of it), they're offshoots of the Protestant movement. For all its faults, the Catholic church had a good idea, that just letting people read the Bible themselves and interpret it their own way would lead to all kinds of bad things, so they tried to keep people from doing that; the Protestant reformation is exactly what led to fundamentalism. Of course, the root problem is the whole idea that a book is "holy" and sacrosanct; trying to keep people from reading things for themselves is guaranteed to fail eventually.
Anyway, probably at least 1/2 of Protestants in the US are evangelical and/or fundamentalist. Just look at how popular the "Left Behind" books are and various other wacky Christian media warning everyone of the "Rapture". Calling it a "small minority" is ignoring a very large and serious problem in our society, no different than Muslims ignoring their own extremists and then waking up one day to find that ISIS has taken over their city.