This article focuses on radicalization. The phenomenon is studied on a dual plane: the effect of both a collective process and an individual clinical process studied by psychoanalysis. This article seeks to show how these two levels of analysis converge into a common issue: a failure of transmission, exclusion, and filial detachment in the personal history of these subjects drive them to cling to a form of collective and political exclusivity. On the collective level, referring to the works of J.C. Monod, the authors suggest conceiving of radicalization as a form of religion that has not been translated into the Western and Christian political register. Being excluded, this religion manifests itself erratically. But the authors argue that what is most important is that these subjects have been deprived of transmission and intimate filiation in their personal history. Only later does this deprivation of the intimate and the subjective take shape, to be expressed and represented on the collective stage.