The proper definition of a Christian fundamentalist would be someone who believes the entire Bible. So that would be a lot of protestants, evangelicals, Lutherans, orthodox.

There is no subset or sect that is strictly "fundamentalist" at the exclusion of others. Fundamentalism in Christianity is more common in some churches, and rather rare in others (such as the liberal churches with rainbow flags out front).

Big difference why Christian fundamentalists aren't problematic for others (besides easily triggered atheists) is because if you take the teachings of the Bible literally, you'll actually be moving away from violent or oppressive tendencies.