Spain is culturally Catholic and increasingly non-practising: around 55 to 60% of Spaniards identify as Catholic, but fewer than one in five attends mass even monthly, and roughly 40% now describe themselves as atheist, agnostic or non-believers. Among Spaniards under 25, the non-religious are the clear majority. This is a country that was officially Catholic until 1978 and has secularised faster than almost anywhere in Europe since.
The Monthly Survey That Tracks the Collapse
Spain has unusually good data because the state pollster, the Centro de Investigaciones Sociológicas, asks about religion in its monthly barometer. The series shows a steady, almost linear decline: Catholic identification was above 80% in the late 1990s and has fallen roughly a point a year since.
The split within that number matters more than the number itself. The CIS distinguishes practising from non-practising Catholics, and the practising share has fallen to around 18 to 20% of the population. The rest are people who were baptised, will probably have a church funeral, and otherwise have no contact with the institution.
Age drives everything. Among Spaniards over 65, Catholic identification is still around 80%. Among those aged 18 to 24 it is nearer 25%, with non-believers and atheists together well over half — one of the steepest generational gradients recorded in Europe.
National Catholicism and How It Ended
Under Franco, Catholicism was not merely the majority religion but part of the definition of the state. The doctrine, nacionalcatolicismo, made the Church a pillar of the regime: divorce was abolished, civil marriage effectively eliminated, religious education compulsory, censorship enforced on Catholic moral grounds, and public Protestant worship restricted.
The Concordat of 1953 with the Holy See formalised the bargain — Franco got a say in appointing bishops, the Church got state funding and control of education and morals. Clergy sat in the Cortes.
The 1978 Constitution ended it in a single carefully worded article. Article 16 states that no confession shall have state character, while adding that public authorities shall take account of the religious beliefs of Spanish society and maintain relations of cooperation with the Catholic Church and other confessions. The wording is a compromise between the two halves of Spain's twentieth century, and it still governs how the state relates to religion.
The Tick Box on the Tax Return
One relic of that cooperation appears every spring. Spanish taxpayers can tick a box on the annual return assigning 0.7% of their income tax to the Catholic Church, and a second box assigning 0.7% to social causes; ticking one does not reduce the other, and ticking neither sends the money to general revenue.
Roughly a third of taxpayers tick the Church box, raising in the region of €300 million a year. The system replaced direct state funding of clergy salaries in a transition agreed in 1979 and completed in 2007.
Other confessions do not have a box. Evangelical, Muslim and Jewish communities signed cooperation agreements with the state in 1992 that grant recognition — religious assistance in prisons and hospitals, tax exemptions, recognised marriages — but no share of the income tax.
Holy Week Belongs to Everyone
Spain's most visible religious phenomenon is also the least dependent on belief. Semana Santa fills the streets of Seville, Málaga, Zamora and Valladolid for a week each spring with processions organised by cofradías — brotherhoods, some founded in the sixteenth century — carrying carved pasos on the shoulders of teams of costaleros.
In Seville alone more than sixty brotherhoods process, some setting out at midnight and returning after dawn on the madrugá of Good Friday. The images they carry, such as the Macarena and the Gran Poder, are objects of intense civic as well as religious attachment.
Participation is not a measure of piety. Membership of a brotherhood is often inherited, and plenty of costaleros and marchers would tell a pollster they do not believe in God. Semana Santa functions as heritage, neighbourhood identity and a great deal of local economy at once — which is why it has grown while mass attendance has fallen.
Eight Centuries of Al-Andalus
Muslim rule in Iberia began with the landing of 711 and ended with the surrender of Granada in January 1492 — a span of nearly 800 years, longer than the United States has existed several times over. At its height the Umayyad Caliphate of Córdoba was among the largest and most learned cities in Europe.
The physical inheritance is unmistakable. The Mezquita of Córdoba, begun in 785, has a Renaissance cathedral inserted into the middle of its forest of columns. The Alhambra in Granada, built by the Nasrids in the thirteenth and fourteenth centuries, is Spain's most visited monument. The Giralda in Seville is a minaret with a belfry on top.
Modern Spain's Muslim population, around 2.5 million or 5%, has almost no continuity with that history. It is overwhelmingly recent, mostly Moroccan in origin, concentrated in Catalonia, Andalusia, Madrid and the Valencian Community, and joined by a substantial number of Spanish converts.
1492 and the Sephardic Expulsion
The same year Granada fell, the Alhambra Decree ordered the expulsion of Jews who would not convert. Estimates of the number who left range widely, from 40,000 to over 100,000, dispersing across North Africa, the Ottoman Empire, Italy and the Netherlands and carrying Ladino — a form of medieval Spanish — with them for five centuries.
Those who converted, the conversos, became the principal target of the Spanish Inquisition, established in 1478 specifically to investigate the sincerity of converts. It was not formally abolished until 1834.
In 2015 Spain passed a law offering citizenship to descendants of expelled Sephardic Jews. Around 130,000 applications were filed before it closed in 2019, mostly from Latin America and Israel. Spain's resident Jewish community remains small, roughly 45,000.
Evangelicals, and the Fastest-Growing Congregations
Protestantism was suppressed for most of Spanish history and remained marginal even after 1978, but evangelical churches have grown steadily, now counting something over a million adherents and by some measures the largest religious group in Spain after Catholics.
The growth is largely immigrant-driven — Latin American, Romanian and West African congregations, with Roma evangelical churches representing a substantial and often overlooked strand. The Filadelfia movement has been the dominant religious force among Spanish Roma since the 1960s.
These congregations often meet in converted commercial premises rather than purpose-built churches, which makes them statistically significant and visually invisible in a country whose skyline is defined by cathedrals.
The Camino Walks Again
The pilgrimage route to Santiago de Compostela had almost died out by the middle of the twentieth century. In 1985 fewer than 700 people collected a compostela, the certificate issued to those who complete the last hundred kilometres on foot. In 2023 the figure passed 440,000.
The revival owes something to UNESCO listing in 1993, something to the Holy Years when 25 July falls on a Sunday, and a great deal to a shift in what pilgrims say they are doing. Surveys taken at the pilgrim office in Santiago find a large share describing their motives as spiritual but not religious, or cultural and sporting rather than devotional.
Galicia has rebuilt an economy around it — albergues, waymarking, luggage transfer — and the routes now run from France, Portugal and the Spanish north coast. It is the clearest case in Spain of a religious institution surviving by being adopted for other reasons.
Religion Class, and the Argument That Never Ends
Under the 1979 agreement with the Holy See, state schools in Spain must offer Catholic religion as a subject, taught by teachers the bishops select and the state pays. Pupils choose whether to take it, and roughly half do at primary level, falling sharply through secondary.
Whether the grade counts towards academic averages has been changed by nearly every education law since — reversed by the Socialists, restored by the Popular Party, reversed again under the 2020 LOMLOE, which also removed the requirement for an alternative subject. Few policy questions in Spain change hands so predictably with the government.
Islamic religious instruction is legally available where enough families request it, following the 1992 agreement, but is offered in only a fraction of eligible schools, with Ceuta, Melilla and Andalusia furthest ahead.
A Catholic Country That Legalised Everything First
The most telling measure of Spanish secularisation is legislative. Divorce was legalised in 1981, six years after Franco's death. Same-sex marriage passed in 2005, making Spain the third country in the world to do it, over explicit opposition from the bishops and mass demonstrations. Abortion was liberalised in 2010 and euthanasia legalised in 2021.
On each occasion Spain moved earlier than most of Catholic Europe, and earlier than the United States. Polling consistently found majority public support, including among self-identified Catholics.
That is the paradox worth holding onto: a country where the Church still owns the calendar, still processes through the streets in front of enormous crowds, and still receives a slice of income tax — while its teaching carries almost no weight in how Spaniards actually legislate or live. Across Europe's 44 countries, few have separated cultural attachment from doctrinal authority so completely — the nearest parallel is France, which arrived somewhere similar by legislating secularism rather than drifting away from the pews.