A word born to defend twelve doctrinal pamphlets, broadened by scholars into a comparative category spanning every major religion, and flattened by popular speech into an insult for any belief system taken too seriously.
“Fundamentalist” gets thrown at almost any religious or spiritual system that claims to be a complete, internally consistent framework for living, as though seriousness itself were the offense. The word carries a settled, negative charge in everyday use, but its actual history is more specific and more contested than that charge suggests, and it names two genuinely different things: a datable historical movement, and a later scholarly attempt to generalise from it.
Where the word came from
The term traces to The Fundamentals: A Testimony to the Truth, a twelve-volume set of pamphlets published between 1910 and 1915, financed by oil businessmen Lyman and Milton Stewart and distributed free to hundreds of thousands of pastors, missionaries, and students across the English-speaking world. The essays defended a specific list of core doctrines, among them biblical inerrancy, the virgin birth, and the bodily resurrection, against what their authors saw as the corrosive influence of theological liberalism and Darwinian biology inside American Protestant seminaries.
The word “fundamentalist” itself came slightly later. In 1920, Curtis Lee Laws, editor of the Baptist newspaper the Watchman-Examiner, coined it to describe those within the Northern Baptist Convention who meant “to do battle royal” for the fundamentals laid out in those pamphlets. At its origin, the label was closer to a self-description by a defined movement than an outsider’s slur, though it acquired negative connotations quickly as the movement clashed publicly with modernist theology, most famously at the 1925 Scopes trial.
The comparative, academic redefinition
The word left its Protestant home in the late twentieth century. From 1987 to 1995, historian Martin Marty and sociologist R. Scott Appleby led the Fundamentalism Project at the University of Chicago, a five-volume comparative study funded by the American Academy of Arts and Sciences. The project applied “fundamentalism” as an analytic category across religious traditions well beyond Christianity, examining reactive, boundary-drawing movements within Judaism, Islam, Hinduism, Sikhism, and Buddhism.
In this academic sense, fundamentalism is not simply a synonym for literal scriptural reading or intense devotion. Marty and Appleby characterised it as a distinctly modern, reactive phenomenon: a selective retrieval of doctrines and practices from a tradition, mobilised militantly against a perceived threat from secularising modernity, and organised around sharp boundaries between an in-group and an outside world treated as corrupting. On this definition, a movement can be textually literalist without being fundamentalist in this technical sense, and a fundamentalist movement can reinterpret its own tradition quite freely so long as it serves that oppositional stance.
The dismissive, popular usage
Outside the academic literature, “fundamentalism” rarely does this specific descriptive work. It functions instead as a ready-made insult, applied to almost any religious or spiritual system that claims comprehensive authority, particularly one that extends into economics, law, or politics rather than staying confined to private belief. The label is often attached without engaging what the system actually claims; its coherence and internal rigor are treated as more suspicious, not less, because a framework serious enough to organise an entire way of life reads as totalising by default in a culture that expects religion to stay privatised.
Some who study or practise within traditions carrying this label have pushed back on that usage, arguing that what gets dismissed as “fundamentalism” is frequently the opposite of crude or primitive: a comprehensive system that integrates ethics, law, economics, and epistemology from a small set of foundational principles is, on this reading, sophisticated systems-thinking rather than a failure of nuance. This is a contested, minority reframing rather than an academic consensus. It does not erase the Marty-Appleby sense of the word, which most religious-studies scholars still use for reactive, boundary-policing movements defined against secular modernity, whatever their theology actually says. The two uses, comparative-analytic and popular-dismissive, coexist and are frequently conflated, which is exactly what makes the word so easy to weaponise and so hard to define precisely in any given sentence.