Sectarianism is the hardening of religious, ethnic, or communal identity into a basis for hostility, discrimination, and political competition. It surfaces wherever group boundaries become the organizing logic of public life, from neighborhood walls in Baghdad to parliamentary seat allocations in Beirut to algorithmically curated social media feeds in Lahore. What makes sectarianism so persistent is that it operates simultaneously at several levels: it is a psychological habit of sorting people into “us” and “them,” a political strategy that rewards leaders who mobilize along communal lines, and increasingly a digital phenomenon amplified by the platforms where billions spend their time.
The Psychology of Sorting
At its most basic, sectarianism feeds on the same cognitive wiring that makes humans quick to form group loyalties of all kinds. Research on intergroup behavior in Pakistan, drawing on the social identity framework developed by Henri Tajfel and John Turner, found that three connected mental processes drive sectarian attitudes among Sunni and Shia communities: categorizing people into groups, identifying personally with one’s own group, and comparing that group favorably against the other. The study found that these processes produced discriminatory patterns in how members of each sect related to one another, even among people who were otherwise similar in education and social class.1Pakistan Review of Social Sciences. Sectarianism and Social Identity in Pakistan
None of this requires genuine theological disagreement. Many people living in sectarian environments could not articulate the doctrinal differences between their group and the other in any detail. The division functions more like a tribal marker: it tells you who to trust, who to hire, who your children should marry, and whose neighborhood to avoid. Once a community has sorted itself this way, the psychological machinery is self-reinforcing. Perceived threats from the outgroup strengthen identification with the ingroup, which heightens the sense of threat, and the cycle continues. This is why sectarianism can persist long after the original cause of the split has faded into history.
When Sectarianism Becomes Urban Architecture
One of the most visible and durable consequences of sectarianism is physical segregation. Baghdad offers a stark example. Before 2003, the city’s neighborhoods were often mixed, with Sunni and Shia families living alongside each other. After the invasion and the years of civil war that followed, the city was carved up along sectarian lines. Concrete blast walls went up between neighborhoods, checkpoints multiplied, and families moved or were forced out to live among co-sectarians. Research on Baghdad’s transformation describes how this comprehensive wall-building campaign altered the city’s entire fabric, effectively undoing decades of rational urban planning.2Journal of Planning History. Urban Unplanning: How Violence, Walls, and Segregation Destroyed the Urban Fabric of Baghdad
The walls were intended as temporary security measures. Many remained for years. Their effect went beyond physical safety: they reshaped daily routines, commute patterns, commercial life, and social networks. A shopkeeper who once served customers of all backgrounds now served only one community. Children grew up without ever meeting someone from the other sect in a normal, everyday context. This matters because, as we will see, casual personal contact across sectarian lines is one of the few things that reliably reduces prejudice. When the built environment makes that contact impossible, the division calcifies.
Baghdad is not unique. Belfast’s “peace walls” separating Catholic and Protestant neighborhoods carried a similar logic for decades, and some remain standing today. Sectarian geography tends to outlast the violence that created it because once people have relocated, rebuilt social networks, and invested in property within their enclave, there is little incentive to reverse the process, even when the fighting stops.
Power-Sharing Arrangements and Their Traps
Governments in deeply divided societies sometimes try to manage sectarianism through formal power-sharing, allocating political offices, cabinet posts, and civil service positions according to communal quotas. Lebanon’s confessional system is the most studied example. Seats in parliament, the presidency, the prime ministry, and the speakership are all assigned to specific religious communities. The idea is to guarantee every group a stake in the state, preventing any one from dominating the others.
In practice, this system has entrenched the very divisions it was meant to manage. Research on Lebanon’s power-sharing dynamics identifies three recurring problems: chronic political deadlock, because decisions require agreement among leaders who represent competing communities and have little incentive to compromise; institutionalized impunity, because sectarian leaders protect their allies from accountability; and a disconnect between political elites and ordinary citizens, who increasingly demand nonsectarian governance but have no institutional path to achieve it.3Middle East Law and Governance. Lebanon’s Endemic Power-Sharing Dilemmas and their Manifestation in the Beirut Blast The 2020 Beirut port explosion became a microcosm of these failures: a disaster rooted in negligence that demanded accountability and reform, but was met instead with the familiar pattern of blame-shifting and obstruction by sectarian power brokers.
The deeper problem is that when political power flows through sectarian identity, citizens have a rational incentive to stay identified with their sect. Voting across communal lines means losing the patronage and protection your community’s leaders provide. The system rewards sectarian loyalty even among people who are tired of it. Iraq after 2003 followed a broadly similar trajectory, with political offices and public resources distributed along ethno-sectarian lines, a pattern that research has linked to entrenched clientelism and factional competition for state resources.4Middle Eastern Studies. Clientelism: factionalism in the allocation of public resources in Iraq after 2003
Education as a Sectarian Incubator
Schools are supposed to be one of the places where a society builds shared identity across its internal divisions. In practice, education systems in sectarian societies often do the opposite. A conceptual analysis of Lebanon’s educational landscape found that weak educational policies have de-emphasized national identity and permitted the establishment of religiously segregated schools, contributing to the growth of sectarian divisions among communities.5Education and Urban Society. Has the Educational System in Lebanon Contributed to the Growing Sectarian Divisions?
In Lebanon, many schools are operated by religious institutions and serve overwhelmingly single-sect student bodies. Curricula emphasize the community’s narrative rather than a shared national story. History textbooks in one school system may present a completely different account of the same civil war from those in another. The result is that young Lebanese often arrive at adulthood with deeply different understandings of their own country’s past, and with social networks that remain almost entirely within their own community. Similar dynamics have played out in Northern Ireland’s segregated school system and in parts of South Asia where religious schools serve as primary education for underserved communities.
The challenge is not simply one of integration mandates. Families in divided societies often prefer same-community schools because they trust them to keep their children safe and to transmit cultural values. Changing the educational landscape means addressing those fears, which are sometimes well-founded, alongside curriculum reform.
Algorithms and the New Sectarian Echo Chamber
Sectarian division used to require physical proximity, shared territory, and face-to-face provocation. Social media has changed that equation. Research on Muslim-majority social media platforms found that algorithmic content curation amplifies confirmation bias, resulting in selective exposure to doctrinally homogeneous viewpoints. The same study found that algorithmic recommendations disproportionately promote content with strong in-group signaling, particularly doctrinal exclusivity and adversarial framing of other Muslim groups. Users exposed to such feeds showed reduced cross-sectarian engagement and increased rhetorical hostility.6International Journal of Noesantara Islamic Studies. Echo Chambers of Faith: An Algorithmic Analysis of Religious Polarization on Muslim-Majority Social Media Platforms
The mechanism is straightforward. Platforms are designed to keep you scrolling. Content that provokes strong emotion, including outrage at another group, generates more engagement. The algorithm learns what keeps you engaged and serves more of it. In a sectarian environment, this means that a user who clicks on one piece of content critical of another sect will be fed a steady diet of increasingly hostile material. A qualitative study focused on Pakistan found that platforms like Facebook, TikTok, and X facilitate what the authors call “epistemic isolation,” in which users end up enclosed in a self-reinforcing bubble of sectarian content that functions as an algorithmic form of religious authority.7Social Sciences Spectrum. The role of social media algorithms in fueling radicalization in Pakistan
This is not a phenomenon limited to any one country or religion. The same algorithmic dynamics apply wherever identity-based hostility generates engagement: Hindu-Muslim polarization in India, political tribalism in the United States, anti-immigrant sentiment in Europe. But in societies already primed by sectarian division, the effect is especially corrosive because the offline infrastructure of segregation and distrust amplifies whatever the algorithm delivers. A teenager in a homogeneous neighborhood, attending a single-sect school, scrolling a feed curated to reinforce hostility toward the other group, has essentially zero exposure to any countervailing perspective.
What Actually Reduces Sectarian Prejudice
The most robust finding in decades of intergroup relations research is that positive, personal contact between members of different groups reduces prejudice. This holds for sectarian divides specifically. A study of educated youth in Pakistan found that high-quality intergroup contact significantly reduced both religious and sectarian prejudice. But the study added an important caveat: mere contact quantity could actually make prejudice worse if the interactions were not positive. Simply being around members of another sect is not enough; the contact has to be genuine, voluntary, and ideally cooperative.8Regional Lens. Prejudice Against Religious and Sectarian Others among Educated Youth of Pakistan: The Impact of Religiosity, Intergroup Contact, Intergroup Threats and Intergroup Anxiety
This quality-over-quantity finding explains a lot about why desegregation alone does not automatically reduce sectarian feeling. Forced coexistence in tense conditions can entrench hostility rather than dissolve it. What works is structured, positive interaction where people collaborate on shared goals, and where institutional support makes the interaction feel safe.
Research from Northern Ireland has extended this logic into the digital realm, with results that complicate the usual assumption that online contact is a pale substitute for meeting in person. A large study of Catholic and Protestant respondents found that while positive face-to-face contact remained the strongest predictor of reduced sectarian prejudice, positive online contact was also a significant predictor and explained unique variance beyond what face-to-face contact accounted for. Online and face-to-face contact each contributed independently to lower prejudice levels. The researchers concluded that virtual forms of contact “are not necessarily secondary in terms of their impact on prejudice or mere ‘stepping stones’ to promote real interactions. They are important in their own right.”9PLoS ONE. The contact hypothesis and the virtual revolution: Does face-to-face interaction remain central to improving intergroup relations?
There is a tension here with the algorithmic echo-chamber findings discussed earlier. Online platforms have the potential to facilitate exactly the kind of cross-group contact that reduces prejudice, but their business model rewards the opposite: keeping users inside their identity bubble. Whether the net effect of digital life is to increase or decrease sectarian prejudice depends on which force wins out in a given context, and right now, the algorithm is winning in most places.
Virtual Reality as a Contact Laboratory
Researchers in Northern Ireland have gone a step further, testing whether virtual reality can create the conditions for prejudice reduction in a controlled setting. In a study using VR interactions between Catholic and Protestant participants, results showed strong evidence that prejudice decreased after the experience compared with before, particularly in conditions where participants’ different group identities were made visible rather than downplayed. Interestingly, the approach that emphasized intergroup difference performed better at reducing prejudice than conditions that tried to create a common shared identity or that avoided group labels entirely.10Computers in Human Behavior. Reducing sectarian prejudice through virtual reality in the post-conflict context of Northern Ireland
The finding is counterintuitive. You might expect that downplaying differences would make people get along better. But the evidence suggests that acknowledging group identity while still having a positive interaction is more powerful. It allows people to update their beliefs about the outgroup as a group, rather than making an exception for one individual. The VR study did not find significant improvement in outgroup trust or prosocial intentions, however, suggesting that reducing the negative emotion of prejudice is easier than building the positive foundations of trust. Prejudice reduction and trust-building appear to be different processes, not just two sides of the same coin.
Sectarianism in Diaspora Communities
Sectarian divisions do not stay behind when people emigrate. Research on Iraqi diaspora communities in the United Kingdom and Sweden found that the ethno-sectarian dynamics reshaping Iraq after 2003 directly affected how diaspora members engaged in political life. The social categories of ethnicity, religion, and gender created positions of both privilege and subordination within the diaspora, shaping who could mobilize politically, on whose behalf, and in what spaces. Individuals’ positions relative to the dominant ethnic or religious political parties back home determined the nature of their diasporic mobilization.11Global Networks. Ethno‐sectarianism in Iraq, diaspora positionality and political transnationalism
In practice, this means that a Sunni Iraqi in London and a Shia Iraqi in London may operate in entirely separate political networks, attend different community events, and engage with homeland politics through different channels, even though they share a nationality, a language, and often a neighborhood. Sectarian identity gets reinforced by transnational media, by remittances flowing to co-sectarian communities, and by political organizations that mobilize the diaspora along communal lines. For some diaspora members, distance from the homeland actually intensifies sectarian identification, because the community abroad becomes a smaller, more tightly bonded group where deviation from the communal line is more visible and more costly.
This transnational dimension matters because diaspora communities are not passive observers of homeland conflicts. They fund political movements, lobby host-country governments, and shape narratives about the conflict for international audiences. When those communities are themselves organized along sectarian lines, their influence tends to reinforce rather than moderate the divisions at home.
Why Sectarianism Is Harder to Fix Than It Looks
People often talk about sectarianism as though it is primarily a problem of ignorance or ancient hatred, solvable through education or goodwill. The reality is that sectarianism persists because it serves concrete interests. Political leaders who derive their power from communal mobilization will resist any reform that undermines their base. Business elites embedded in patronage networks tied to a particular community will defend those networks. Religious institutions that derive authority from maintaining communal boundaries have structural reasons to preserve them.
This means that individual-level prejudice reduction, as promising as the contact and VR research is, runs into structural barriers. You can reduce a person’s prejudice toward the other group, but if the jobs, the housing, the political representation, and the legal protections all still flow through sectarian channels, that person’s behavior may not change much. The Lebanese citizen who is personally tolerant still has to navigate a system in which their sect determines which bureaucrat handles their paperwork. The Iraqi voter who wants nonsectarian governance still faces a ballot with candidates organized along communal lines.
Effective de-sectarianization requires working on multiple levels simultaneously: changing individual attitudes through contact and education, reforming institutions that reward communal loyalty, building cross-cutting civic organizations that give people reasons to cooperate across lines, and addressing the digital ecosystem that currently profits from polarization. None of these is sufficient on its own. Together, they represent a long, difficult project that most divided societies are only beginning to undertake. The evidence suggests the project is possible, but no one should mistake it for easy.