Patterns of religious practices along age and sex for immigrant groups coming from North Africa, the Sahel and to a lesser extent Turkey differ from those prevailing for Europeans, with a more intense religiosity for men and the younger. Using survey data (MGIS 1992 TEO 2008) and mobilizing some results from other sources (European values EVS ESS, ISSP and the WVS surveys), we compare religious practices and the importance given to religion for immigrants from the south living in France to the evolution of religion in their country of origin. Our findings suggest that, while being related to individual characteristics, the family and the socialization contexts, religiosity is increasingly marked by issues of identity for these immigrant groups.