Mediation involves a relation of reciprocity between opposed parties who, moreover, can come to terms or reach an agreement under certain conditions. Such is the case for relations between Christian representations, in their otherworldly dimensions, and history with its procession of worldly constraints concerned with social reproduction. Among the possible modalities, these representations affect life in society by creating links with institutions. But this does not mean that the tensions between the agencies in question disappear. Indeed, the institution of origins continues to provoke conflicts even within Churches themselves, which base their identity on a founding text which can be used to bring them into question—which accounts for the differentiation in Christianity's historical figures. Each claims to affirm a socio-religious difference in society and to exercise some influence, between intransigence and compromise. The modalities of this are complex, such as with regard to the relations between Catholicism and modernity.