The phrase "fundamentalist faith" refers to a very strict or conservative belief system that follows the core principles and teachings of a particular religion or ideology without questioning or adapting them to the modern world. Full definition
Already, in some quarters on the left, it has become fashionable to fret that Pence's fundamentalist faith and comparative political savvy would make him an even more «dangerous» president than Trump. (theatlantic.com)
I grew up in a fundamentalist faith tradition in a family of 5, working class family, parents who did not graduate from high school and who had significant psychological problems of their own. (nakedpastor.com)
The love, pride and unadulterated certainty of his family bound him to his fundamentalist faith in a way that perhaps was unique among the experiences of these four writers. (religion-online.org)