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This paper is a development of an older research (1976) about the geography of divides between catholic bourgeoisie and non-catholic bourgeoisie. It analyses if this still applies currently and moreover for the whole society. To this end we analysed two professions, secondary school students, electoral results and youth movements, depending on their catholic nature or not. Among upper classes, the geography came down from the growth of the first suburbs during the 19th century (catholics in the east, non-catholics in the south) are still relevant today despite social evolutions and the time which has elapsed. This is due to socio-geographic inertia and recent locations of catholic or secular institutions close to their 'natural'? sociological area. Working-classes, who are to some extent muslims, are living in areas possibly secular but at least with a quite slight often catholic presence.