The dechristianization of France during the French Revolution is a conventional description of the results of a number of separate policies conducted by various governments of France between the start of the French Revolution in 1789 and the Concordat of 1801, forming the basis of the later and less radical Laïcité movement. The goal of the campaign between 1793 and 1794 ranged from the public reclamation of the massive amounts of land, power, and money held by the Catholic Church in France to the termination of Catholic religious practice and of the religion itself. The dechristianization campaign also included removal and destruction of religious objects from places of worship. There has been much scholarly debate over whether the movement was popularly motivated.
The French Revolution initially began by attacking the church corruption and the wealth of the higher clergy, an action popular even with many Christians, as a reaction against the dominant role of the Catholic church in pre-revolutionary France. During a two-year period known as the Reign of Terror, the episodes of anti-clericalism grew more violent than any in modern French history. The new revolutionary authorities suppressed the church; abolished the Catholic monarchy; nationalized church property; exiled 30,000 priests and killed hundreds more. As part of the campaign to dechristianize France, in October 1793 the Christian calendar was replaced with one reckoning from the date of the Revolution, and Festivals of Liberty, Reason and the Supreme Being were scheduled. New forms of moral religion emerged, including the deistic Cult of the Supreme Being and the atheistic Cult of Reason, with the government briefly mandating observance of the former in April 1794.
In 18th-century France, the vast majority of the population adhered to the Catholic Church as Catholicism had been since the revocation of the Edict of Nantes in 1685 the only religion officially allowed in the kingdom. Nonetheless, there were minorities of French Protestants (mostly Huguenots & German Lutherans in Alsace) and Jews still lived in France at the beginning of the Revolution. The Edict of Versailles, commonly known as the Edict of Tolerance, had been signed by Louis XVI on 7 November 1787 and had given non-Catholics in France the right to openly practice their religions as well as legal and civil status, which included the right to contract marriages without having to convert to the Catholic faith. At the same time, libertine thinkers popularized atheism and anti-clericalism.