This thesis unfolds its overtones within the paradigm of what the philosophers, political scientists, sociologists, theologians, and historians of religion call “Michel Foucault and Christianity”. Based mainly on Du gouvernement des vivants, it takes Christianity as being a regime of truth, and explains on the one hand the link between subjectivity and truth in the Christian regime. On the other hand, it shows the link which exists between the practices of truth-telling, the political history of government techniques of individuals and forms of subjectivity, in particular in Christian sexual ethics. After the analysis of the institutionalised Christian practices such as baptism, penance, and spiritual guidance, it tries to pit Michel Foucau...