Anti-clericalism is opposition to religious authority, typically in social or political matters. Historical anti-clericalism has mainly been opposed to the influence of Roman Catholicism. Anti-clericalism is related to secularism, which seeks to remove the church from all aspects of public and political life, and its involvement in the everyday life of the citizen.
Anarchist and Communist movements are anti-religion and anti-clerical, but not all anti-clericals are irreligious or anti-religion. Some have opposed clergy on the basis of moral corruption, institutional issues and/or disagreements in religious interpretation, such as during the Protestant Reformation. Anti-clericalism became extremely violent during the French Revolution because revolutionaries believed the church had played a pivotal role in the systems of oppression which led to it. Many clerics were killed, and French revolutionary governments tried to control priests by making them state employees.
Anti-clericalism appeared in Catholic Europe throughout the 19th Century, in various forms, and later in Canada, Cuba, and Latin America. Various rumblings can be seen erupting from time to time in the Islamic world.
The Civil Constitution of the Clergy was passed on July 12, 1790, requiring all clerics to swear allegiance to the French government and, by extension, to the increasingly anti-clerical National Constituent Assembly. All but seven of the 160 bishops refused the oath, as did about half of the parish priests. Persecution of the clergy and of the faithful was the first trigger of the rebellion; the second being conscription. Nonjuring priests were exiled or imprisoned and women on their way to Mass were beaten in the streets.
The anti-clericalism during the French Revolution initially began with attacks on church corruption and the wealth of the higher clergy, an action with which even many Christians could identify, since the Roman Catholic church held a dominant role 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 European history. The new revolutionary authorities suppressed the church; abolished the Catholic monarchy; nationalized church property; exiled 30,000 priests and killed hundreds more. Many churches were converted into "temples of reason," in which atheistical services were held. There has been much scholarly debate over whether the movement was popularly motivated. 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 France's first established state sponsored atheistic Cult of Reason, with all churches not devoted to these being closed. In April and May 1794, the government mandated the observance of a festival of the Cult of the Supreme Being. When anticlericalism became a clear goal of French revolutionaries, counter-revolutionaries seeking to restore tradition and the Ancien Régime took up arms, particularly in the War in the Vendée (1793 to 1796). Local people often resisted dechristianisation and forced members of the clergy who had resigned to conduct Mass again. Eventually, Maximilien Robespierre and the Committee of Public Safety denounced the dechristianization campaign and tried to establish their own religion, without the superstitions of Catholicism.