According to Michel Foucault, the birth of Christianity is maybe the most important factor for the genesis of the modern subject. In particular, from the beginning the monk and in the modern epoch the subject in general have learned to confess completely oneself to the director or to the psychanalyst, depending on the circumstances. To confess oneself and to be submitted: there are the main competences of the western subject, differently from the Hellenistic philosophers! Discussing at the first the connection between biblical Hermeneutic and Hermeneutic of the Self and then the kierkegaardian philosophy of the existence, this essay trays to examine the Foucauldian criticism of Christianity.