The Monastic Fraternity of Jerusalem, a new monastic order, is housed in the Parisian Saint-Gervais-Saint-Protais church since 1975. It offers there an attractive singular religious experience to very numerous believers. On the basis of a detailed analysis of the daily and weekly rituals organized there, this article shows how lay and religious people conceive their relationships with each other and with God on the one hand and form a Family of Jerusalem on the other.