History of Roman Catholicism in Mexico

The history of the Roman Catholic Church in Mexico dates from the period of the Spanish conquest (1519–21) and has continued as an institution in Mexico into the twenty-first century. Catholicism is one of the two major legacies from the Spanish colonial era, the other being Spanish as the nation's language. The Catholic Church was a privileged institution until the mid nineteenth century. It was the sole permissible Church in the colonial era and into the early Mexican Republic, following independence in 1821. At some point in the twentieth century, Eastern Catholic jurisdictions were established in Mexico, but Roman Catholicism remains the largest religious group.

In the mid-nineteenth century the liberal Reforma brought major changes in church-state relations. The Mexican state challenged the Catholic Church's role in education in Mexico, property ownership, birth, marriage, and death records, in anticlerical laws. Many of these were incorporated into the Constitution of 1857, restricting the Church's corporate ownership of property and other limitations. President Porfirio Díaz (1876–1911) pursued a policy of conciliation with the Catholic Church, keeping the liberal anticlerical articles of the constitution in force, but in practice allowing greater freedom of action for the Catholic Church. With Díaz's ouster in 1911 and the decade-long conflict of the Mexican Revolution, the victorious Constitutionalist faction led by Venustiano Carranza wrote the new Constitution of 1917 that strengthened the anticlerical measures in the liberal Constitution of 1857.

With the presidency of Northern, anticlerical, revolutionary general Plutarco Elías Calles (1924–28), the State's enforcement of the anticlerical articles of Constitution of 1917 provoked a major crisis in Mexico with violence in a number of regions of Mexico. The Cristero Rebellion (1926–29) was resolved, with the aid of diplomacy of the U.S. Ambassador to Mexico, ending the violence, but the anticlerical articles of the constitution remained. President Manuel Avila Camacho (1940–1946) came to office declaring "I am a [Catholic] believer," (soy creyente) and Church-State relations improved though without constitutional changes.

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