This study establishes that fundamentalism is the most radical form of the multiple religious phenomena that proliferate in contemporary societies (M. Milot, 1998). Fundamentalism first designated currents that want to defend the entirety of the Catholic tradition: dogmas, norms, morals, rites. Qualitative in nature, this reflection aims to analyze the foundations of religious fundamentalism with a view to containing the phenomenon in sub-Saharan Africa. The use of field data coupled with documentary research has led to the conclusion that the upward force of religious radicalization provokes strong reactions in most societies and that a fight against this ascendancy is a means of putting an end to the plural and multifaceted fundamentalism that threatens peace.