Because it has experienced a process of secularisation for more than three centuries, France can be considered as a laboratory of the relevance of faith in a society for which it is no longer the cultural matrix. By showing how the central question of secularisation is in fact that of the relationship between faith and culture, this article proposes to consider Catholic schools as places where a new way for the Catholic Church to support humanity in its growth, at a personal and community level, is being elaborated.