Christianity in Ireland
largest religion in Ireland, Roman Catholic, Protestant, Orthodox, and others
Christianity has been the largest religion in Ireland since the 5th century. After a pagan past of Antiquity, missionaries (most famously including Saint Patrick) converted the Irish tribes to Christianity in quick order. This produced a great number of saints in the Early Middle Ages, as well as a faith interwoven with Irish identity for centuries since − though less so in recent times.
Most Christian churches are organized on an "all-Ireland" basis, including both the Republic of Ireland and Northern Ireland. In the 2022 census, 76.1% of residents in the Republic of Ireland identified as Christians: 69.1% as Catholics, 4.2% as Protestants, 2.1% as Orthodox Christians and 0.7% as other Christians. In the 2021 Northern Irish census, 79.7% of residents identified as Christians: 42.3% as Catholics, 16.6% as Prebysterian, 11.5% as Church of Ireland members, 2.4% as Methodist and 6.9% as other Christians. Orthodoxy has been the fastest growing branch of Christianity in Ireland since 1991.
Ireland has for many centuries been noted for its perpetually strong Christian faith. However, in recent decades, a "Quiet Revolution" has taken place which has led to increased secularity in various aspects of Irish society. The 1972 amendment of the Irish constitution, for example, removed the "special position" of the Catholic Church as "guardian of the Faith" and the recognition of other named religious denominations in Ireland.
Begin with the source’s own compact description: “Christianity in Ireland” is largest religion in Ireland, Roman Catholic, Protestant, Orthodox, and others. The dossier treats that line as a proposition to test through Christianity, Ireland and largest, not as a finished interpretation.
Why this record matters
The phrase “largest religion in Ireland, Roman Catholic, Protestant, Orthodox, and others” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jun 21, 2026. The linked authority identifier is Q579417. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2022, 2021, 1991 and 1972.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Christianity in Ireland”, its source revision and the description used here.
- Expand the search: follow Christianity in Ireland primary sources, Christianity in Ireland archive and Christianity research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Christianity in Ireland”?
- Which institution is responsible for the underlying evidence?
- Which cited source is closest to the event, object or claim?
Search terms from this dossier
This entry incorporates text from “Christianity in Ireland” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.