What the numbers actually show about Catholic growth since Vatican II
The Catholic Church has more than doubled in baptized members since Vatican II closed in 1965. Six hundred million to just over one point four billion. Impressive, until you notice the other figure. Our share of the human race has not moved. We are still about eighteen percent of the world. Same place we sat sixty years ago.
So did the Council grow the Church? Or did the planet just get bigger while we rode along?
The increase is almost entirely demographic. Africa is the engine. Europe’s share has slipped. The Americas remain the largest bloc. We are larger, more African, more Latin American, and in the old heartlands of Christendom (Europe and North America) smaller in practice, vocations, and cultural weight than we were when the last session of the Council adjourned.
A 2025 NBER paper by Robert Barro and colleagues tracked religious attendance across sixty-six countries back to 1920. Catholic-majority countries showed no special drop before 1965. Then they did. After the Council they declined about four percentage points per decade relative to other Christian countries, or roughly twenty points by 2015. The authors call it a trigger specific to Catholicism.
Why then? Why not ten years earlier?
The simplest answer is also the hardest one to swallow. The reforms loosened distinctiveness. Aggiornamento (an Italian word made famous by Pope St. John XXIII) meant updating to the modern world. The result was a Church that looked and sounded more like the neighborhood. When a religion stops asking much of you, people stop showing up. Latin, Friday abstinence, the sense that the sacred was set apart: those things created a visible boundary. Remove the boundary and the cost of belonging drops. So does the commitment.
There was a credibility problem too. The Council’s texts were written to hold two factions in the same room. Ambiguity produced decades of liturgical experiment and doctrinal fog. People do not leave churches that are strict. They leave churches that seem unsure of themselves.
The timing is damning. The drop starts right after 1965, not before. Secularization and the sexual revolution were real. Catholic countries rode the same wind as everyone else, and then fell faster than Protestant ones. The Barque of Peter did not invent the storm. Rather, the storm hit just as the Council took down its sails.
Mainline Protestants declined even harder, and they never held a Vatican II. In this country they went from over half the population in the late 1950s to about nine or ten percent today. The United Methodists alone dropped from eleven million in 1968 to under four million today. We Catholics lost share too, but lower.
So if they collapsed without a Council, why blame ours?
Because the mechanism is different. Mainline decline tracks the secularization wave hitting every liberal institution at once. Catholic decline, on the Barro numbers, is extra on top of that. We sit in the middle. We kept more structure than the mainline (hierarchy, sacraments, and a sense of permanence) but we loosened exactly where Evangelicals tightened. It was a slower bleed than the Methodists, faster than the Evangelicals. Catholic energy shifted south, in the following decades, where the faith still costs something.
In Africa and parts of Asia, converting can mean family rejection, community pressure, sometimes violence. That cost filters for commitment. The Church there is young and central, not a fading inheritance. North America is the opposite. For millions, Catholicism is the default — inherited, not chosen. When belonging is free, it competes with the interests of the world (sports, theater, television, etc.) and loses.
Not every cost works. Guilt and pointless rules just drive people out. What works is a costly signal: something that marks you as committed: baptism in a hostile village, Sunday Mass when it means standing out, a creed you actually have to defend. That is why the Mainline Protestant churches emptied and Evangelicalism held in the same culture. One removed the signal. The other kept it.
Look at the American map. Between 2010 and 2020, the American South and West added about six million Catholics. The Northeast and Midwest lost three million. Texas, California, Arizona, and Florida took the biggest gains. Nevada and Arizona jumped hardest by percentage. The South now has more Catholics than any other region. The old heartland in the North is still bleeding.
Is that revival?
Mostly no. Sun Belt growth tracks Hispanic population almost one-to-one. Internal migration from the Northeast is the second engine. Native-born conversion is a distant third. The American Church is catching Catholics as they migrate. It is not making them.
Ordinary Novus Ordo life is shrinking. Weekly Mass sits around twenty to twenty-five percent of self-identified Catholics. That’s down from nearly half in the early 1970s. Pew still shows about eight former Catholics for every new convert. Parishes are still closing and Catholic schools are merging.
Traditional Latin Mass communities move the other way, just from a tiny base. A Crisis Magazine survey found average Sunday attendance up about thirty-four percent in two and a half years, near seventy percent when new venues are counted. The FSSP has roughly tripled its priests since the late 1980s. Pew still puts regular TLM attendance at about two percent of Catholics. It’s real growth for them, but not for the Church as a whole.
After Traditionis Custodes in 2021, a National Catholic Register survey found sixty percent of those parishes went flat or down. Momentum slowed. It did not reverse. If the rite alone were the magnet, why did restriction matter?
Because the community is the engine. The rite is the stage.
The Ordinariate of the Chair of Saint Peter is the English control case: same reverence, same formality, vernacular throughout, born from Anglicans who wanted to keep their patrimony. They had about twelve thousand members and seventy-nine priests by 2023. That’s fast growth for the first decade. Then it matured. The FSSP side is broader and still drawing. Late 2025 figures: 579 members, 387 priests, 162 seminarians, average age thirty-nine, 251 Mass centers. Apostolates double and triple. FSSP parishes outgrow diocesan Latin Masses using the same rite. Why? It is likely priests formed in a traditional house, parishes that self-select and high expectations from day one.
Yeoman’s national TLM surveys put the crowd at roughly twenty percent converts from outside the Church, twenty-five percent reverts, the rest are cradle Catholics. The Novus Ordo baseline is about two percent converts. Among TLM converts, Bullivant and Cranney found about sixty-five percent came from Protestant backgrounds. The outsider share is real. It is still a minority. Most of the TLM growth is Catholics choosing the old rite — not Protestants flooding the doors.
A handful of Sun Belt dioceses can match TLM numbers on raw headcount (Phoenix, Atlanta, Charlotte) because people are arriving. Strip out migration and the mainstream rate falls back toward flat. In contrast, the Latin Mass rate holds wherever it is planted.
That is the ledger. Now the question people keep asking: what if the Novus Ordo were celebrated as a vernacular traditional Mass — same solemnity, same high-commitment community, with the Consecration and Agnus Dei left in Latin, while the Kyrie is left in Greek?
On paper you keep the costly signal, some of the mystery, and the culture. Short term you would expect a surge. Long term you still cannot decree the one thing that took decades to grow: a people who chose the old rite against the grain. You can restore the form. You cannot skip the generation.
The Ordinariate already proves part of it. Reverence in English draws. It draws slower, and from a narrower base, than communities that spent decades becoming a people. The rite matters. The community matters more. The visible boundary matters last.
The Church did not shrink because the world got modern. The world got modern everywhere. The places that kept a costly, visible, demanding faith held or grew. The places that tried to look like the neighborhood emptied.
That is not nostalgia. That is the books.
Sources
- Annuario Pontificio / Annuarium Statisticum Ecclesiae (Vatican statistical yearbooks): baptized Catholic population circa 1965 (~600 million) and 2024 (1.422 billion).
- Pew Research Center, Religious Landscape Study and related reports on U.S. Catholic identity, converts vs. cradle Catholics, Mass attendance, and Traditional Latin Mass attendance (including 2023–24 RLS and 2025 convert profile).
- Robert Barro et al., NBER working paper (2025) on religious attendance across 66 countries, 1920–2015, Catholic-majority vs. other Christian countries.
- Crisis Magazine, “The Growth of the Latin Mass: A Survey” (2021): parish-level TLM attendance 2019–2021.
- John Paul Yeoman, national TLM surveys (reported via LifeSite and related coverage): convert, revert, and cradle shares among TLM attendees; contrast with Novus Ordo convert rates.
- Stephen Bullivant and Stephen Cranney, surveys of TLM Catholics (reported in Catholic World Report and related coverage): convert backgrounds, orthodoxy, Vatican II acceptance.
- Priestly Fraternity of Saint Peter, official statistics update (1 November 2025): members, priests, seminarians, Mass centers, personal parishes.
- National Catholic Register reporting on Traditionis Custodes parish effects, diocesan convert numbers, and Ordinariate growth.
- Personal Ordinariate of the Chair of Saint Peter public membership and clergy figures circa 2023.
- CARA (Center for Applied Research in the Apostolate) and Official Catholic Directory figures on U.S. baptisms, receptions, and priestly demographics, as cited in secondary reporting.
- U.S. regional Catholic population change 2010–2020 (Census-linked and diocesan reporting summarized in Pew and Catholic press): South/West gains vs. Northeast/Midwest losses.
- Comparative mainline Protestant membership (United Methodist and broader mainline share of U.S. population, late 1950s to present) from standard denominational and Pew time series.
Shane Schaetzel is an author of Catholic books and he is an Evangelical convert to the Catholic Church. His articles have been featured on LifeSiteNews, The Remnant Newspaper, Forward in Christ, and Catholic Online. You can read Shane’s books at ShaneSchaetzel.Com
