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Scholars have long considered 18th century Paris as an early model for de-Christianisation. This paper aims to re-examine this schema by describing the religious practices of Parisians in their specific context. These practices generally fall within the framework of the parish, although deviations from this norm are not unusual. Of course, they depend on social identities. But above all, the Jansenist quarrel, due to the consequences of the apostolic constitution Unigenitus (1713), gives meaning to the gestures of belief. Both the Jansenists and their antagonists, the dévots, had their own priests, their own sacred places and their own saints. In the Age of Enlightenment, the mobility of the Catholic religion remained as strong as ever.