Religion can help cause, justify, or intensify armed conflict. That does not establish the much broader claim that it causes most wars. “Most” is a statistical claim: it needs a defined set of wars and a defensible method for identifying causes, rather than a list of familiar religious conflicts.
The useful question is how religion operated in a particular conflict. Did it supply the objective, identify an enemy, legitimise violence, or provide institutions through which people mobilised? Those roles can overlap with struggles over territory, political authority, security, and resources.
What Would It Take to Count Religious Wars?
Before accepting a percentage, ask what is being counted. Is the unit a war, a campaign, a conflict between two parties, or a year of fighting? Does the claim concern a particular century or the whole of recorded history? A number of conflicts is also different from a number of deaths.
Definitions matter. The Uppsala Conflict Data Program’s FAQ defines a state-based armed conflict through a contested incompatibility over government or territory, armed force between two parties including at least one state government, and at least 25 battle-related deaths in a calendar year.
That is a research definition for a particular category. It is not a definition of every form of violence or a count of all wars in history. The FAQ’s definition does not classify those conflicts by a single religious cause. Turning it into such a percentage would require additional evidence and explicit coding decisions.
A classification would also need to handle mixed causes consistently. If religious and territorial objectives are both important, excluding one because the other exists distorts the explanation. Counting every war involving religious people as a religious war would be equally unhelpful.
Different Roles Religion Can Play
- An objective: gaining control of a sacred place or enforcing a religious order.
- A justification: presenting violence as a duty or as authorised by sacred teaching.
- A group boundary: identifying who belongs to a community and who is treated as an outsider.
- A means of mobilisation: using trusted leaders, institutions, gatherings, and shared narratives.
These distinctions are tools for examining evidence, not an assumption that religion is merely a disguise for something else. A religious motive can be sincerely held and causally important. It can also coexist with ambition, fear, or material interests. The presence of one motive does not erase the others.
The First Crusade: Religion Was Substantial
The Metropolitan Museum of Art’s account of the Crusades identifies Pope Urban II’s November 1095 sermon at Clermont as a catalyst for the campaigns. It describes access to shrines associated with Jesus, above all the Holy Sepulcher, as a central concern, alongside promises of absolution and eternal glory.
The account also notes hopes of land and wealth. Jerusalem fell to the crusaders on July 15, 1099, followed by the establishment and protection of new territories and churches.
Here religious purposes and territorial consequences were closely connected. Describing the campaign as simply an economic venture would omit a central part of the evidence. Describing it as a purely spiritual enterprise would omit conquest and the violence involved. It should not be romanticised as a journey from ignorance to enlightenment.
The Thirty Years’ War and the Settlement of 1648
The France–Empire treaty reproduced in Yale’s Avalon Project shows political and confessional matters appearing together in the Westphalian settlement. Its opening names the emperor, the French king, and their allies as parties to a destructive war.
Its provisions address a range of claims and restorations. Article XXVIII specifically concerns restoration of churches and ecclesiastical property to adherents of the Augsburg Confession, including the inhabitants of Oppenheim, and religious exercise.
This is direct evidence of what the settlement addressed, rather than a complete explanation of every participant’s motives during the war. It illustrates why political and religious questions cannot always be separated neatly. It also should not be recast as a declaration of unrestricted religious freedom for every person or belief: the cited provision names particular confessional rights and circumstances.
The First World War: Different Questions About Causation
CFR Education’s explanation of the First World War distinguishes the assassination of Archduke Franz Ferdinand from longer-term conditions for conflict. It discusses nationalism, imperial competition, changes in the balance of power, and alliance networks.
Its account explains how commitments and decisions involving Austria-Hungary, Serbia, Germany, Russia, France, and Britain helped a crisis expand. These are mechanisms that need examining; the religious affiliations of populations would not, on their own, explain the declarations of war.
This does not require claiming that religion had no place in anyone’s wartime experience or rhetoric. It means that a causal account must explain the actual decisions and relationships involved. An immediate trigger, an underlying tension, and a justification offered after fighting begins are different parts of that account.
Religious Teaching Can Also Restrain Force
A doctrine concerning war is not automatically a command to fight. The Catholic Catechism, paragraphs 2308–2309, requires efforts to avoid war and sets conditions for the moral legitimacy of military defence.
Those conditions include grave and certain harm by an aggressor, failure of other means, serious prospects of success, and avoiding evils worse than those being resisted. They must be considered together. This is a particular religious ethical framework, not a description of how every Christian government has behaved or a verdict on any current conflict.
Evaluating such a doctrine is also different from establishing whether it caused a historical war. One question concerns a moral argument; the other concerns evidence about events. Religious language can constrain action, authorise it, or be used selectively, and each possibility requires examination.
A Documented Example of Interfaith Peacebuilding
In a KAICIID interview, Pastor James Wuye discusses the Interfaith Mediation Centre, established with Imam Muhammad Ashafa in Nigeria in 1995 after violence had divided their communities.
Wuye describes work across different levels of leadership and an early warning and response system addressing inflammatory rumours. His example concerns investigating a claim about the destruction of a mosque and communicating a correction.
This supplies a concrete account of religious actors working to interrupt escalation. It is a participant’s description, not an independent measurement proving that dialogue always prevents violence. The practical lesson is specific: maintaining relationships, checking claims, and responding to tensions involves sustained work. A celebratory meeting alone cannot demonstrate a lasting peace.
How to Assess a Claim About Religion and War
When encountering an explanation, ask:
- Who is being discussed? Distinguish particular leaders, institutions, and armed groups from entire religious populations.
- What evidence identifies the motive? Look for decisions, demands, documents, and conduct rather than inferring intentions from a group’s name.
- What other causes are considered? Examine political power, security concerns, territory, and resources without assuming they cancel religious motives.
- How was the count produced? Require a period, definitions, sources, and a way of treating mixed cases before accepting a percentage.
- What would peace require? Identify the concrete grievances and institutions involved rather than assuming that changing religious attitudes alone resolves everything.
Careful explanation leaves room for accountability. Recognising several causes does not excuse people who organise violence, and identifying a religious justification does not make every member of a tradition responsible for it.
Conclusion
Religion has played substantial roles in some wars and in some efforts to prevent or resolve violence. The claim that it causes most wars needs evidence that examples alone cannot supply. The Crusades, the Westphalian settlement, and the First World War reveal different relationships between belief, authority, territory, and political decisions. A useful account identifies those relationships case by case, treats mixed motives honestly, and demands clear definitions before accepting sweeping historical statistics.
Published by Ralf. About our editorial process.
