fundamentalism (ˌfʌndəˈmɛntəˌlɪzəm)
—
n 1.
Christianity (esp among certain Protestant sects) the belief that every word of the Bible is divinely inspired and therefore true 2.
Islam a movement favouring strict observance of the teachings of the Koran and Islamic law
3. strict adherence to the fundamental principles of any set of beliefs
I always thought the term should be used as 'BASSAmentalist' rather than 'BASSA mentalist'. The latter is indeed a childish term the likes of which one would expect to hear in the playground. The former, I think, rather neatly distinguishes between those BA crew who are willing to listen to the outside world and those who do adhere strictly, and unthinkingly, to the fundamental principles of BASSAs beliefs.