Sri Lanka operates under Article 9 of its 1978 Constitution, which states that the Republic "shall give to Buddhism the foremost place" while assuring protection to all religions. Buddhism claims 70.2 percent of the population according to the 2012 census, the most recent comprehensive religious data available. Hinduism accounts for 12.6 percent, Islam 9.7 percent, and Roman Catholicism 6.1 percent. These percentages map closely to ethnic divisions: Sinhalese populations are predominantly Buddhist, Tamil populations primarily Hindu, and Moor populations overwhelmingly Muslim. The geographic distribution places Buddhist majorities across the southern, western, and central regions, Hindu concentrations in the Northern and Eastern Provinces, and Muslim communities distributed in coastal areas and the east.
Buddhism arrived in Sri Lanka in 247 BCE when Arahat Mahinda, son of Indian Emperor Ashoka, traveled to the island and converted King Devanampiya Tissa at Mihintale, eight miles from Anuradhapura. Sanghamitta Theri, Mahinda's sister, brought a sapling from the original Bodhi tree under which the Buddha achieved enlightenment. That sapling, planted in Anuradhapura, became the Jaya Sri Maha Bodhi, now recognized as the oldest historically authenticated tree in the world at 2,270 years. The arrival of the Sacred Tooth Relic in the 4th century CE established physical continuity with the historical Buddha. This relic, housed in the Temple of the Sacred Tooth Relic in Kandy since 1595, has defined legitimate political authority for over 1,600 years. Possession of the relic conferred the right to rule, embedding Buddhism into governance structures that persist in modified form today.
Daily Buddhist practice centers on poya days, the four monthly phases of the moon designated as religious observance days. Full moon poya receives particular emphasis. Vesak, the full moon of May, commemorates the Buddha's birth, enlightenment, and death, all believed to have occurred on the same calendar date. Poson in June marks Buddhism's arrival in Sri Lanka. On poya days, businesses close by law in predominantly Buddhist areas, alcohol sales cease nationwide, and devout Buddhists wear white clothing, observe the eight precepts rather than the usual five, and spend extended hours at temples. Temples operate donation systems rather than fixed fees. Morning almsgiving, where monks walk designated routes accepting food from laypeople, occurs daily in areas near monasteries. This practice reinforces the monk-lay relationship fundamental to Theravada Buddhism, the specific tradition practiced in Sri Lanka, which arrived directly from India and maintains Pali language scriptures without the Mahayana additions adopted elsewhere.
The sangha, the community of Buddhist monks, numbers approximately 30,000 across Sri Lanka. Monks train at pirivenas, monastic colleges that combine religious and secular education. Major pirivenas include Vidyodaya and Vidyalankara, both founded in the 1870s during the Buddhist revival movement responding to Christian missionary activity under British rule. Monks receive lifelong financial support through temple endowments, devotee donations, and state allocations. The Ministry of Buddha Sasana, established in 1960, administers government relationships with Buddhist institutions. Monks participate actively in political discourse. The Jathika Hela Urumaya political party, founded in 2004, consists entirely of Buddhist monks as candidates. This political activity divides opinion within the sangha itself, with traditionalists citing the Vinaya rules that prohibit monks from involvement in governance.
Hindu practice in Sri Lanka follows Saivite traditions brought from South India over two millennia. The Nallur Kandaswamy Kovil in Jaffna, built in 948 CE and rebuilt in 1749 after Portuguese destruction, serves as the primary Hindu religious center in the north. Its annual festival runs 25 days each July and August, drawing over 800,000 participants for the final chariot procession. Kataragama in the south functions as a multi-religious site where Buddhists, Hindus, Muslims, and indigenous Vedda people worship. The Kataragama temple complex honors Skanda, known as Murugan in Tamil tradition and Kataragama Deviyo in Sinhala Buddhist practice. This overlap demonstrates the blurred boundaries between Buddhism and Hinduism in Sri Lankan practice, where Buddhists regularly worship at Hindu kovils for specific worldly requests while maintaining Buddhist identity for ultimate spiritual goals.
Daily Hindu observance includes home shrines, morning pujas, and vegetarianism practiced by varying percentages depending on caste and regional origin. Brahmin families maintain strict vegetarianism, while other castes adopt flexible practices. Temple pujas occur at fixed times, typically dawn, midday, sunset, and night. Priests perform elaborate rituals including abhishekam, the bathing of deity statues with milk, honey, and sandalwood paste. Devotees receive vibhuti, sacred ash, and kumkum, red powder, applied to the forehead. Festival calendars follow Tamil traditions, with Thai Pongal in January, Maha Shivaratri in February or March, and Deepavali in October or November drawing the largest observances. These festivals involve family gatherings, special foods, and temple visits. Thai Pongal, a harvest festival, requires cooking rice in new pots until it overflows, symbolizing abundance.
Islam in Sri Lanka divides into two populations with distinct origins. The Sri Lankan Moors descend from Arab traders who arrived between the 7th and 15th centuries and intermarried with local populations. They speak Tamil and concentrate in coastal trading centers like Galle, Colombo, Beruwala, and the eastern cities of Batticaloa and Trincomalee. The Malays, about three percent of the Muslim population, descend from Southeast Asian soldiers brought by the Dutch in the 17th century and exiles sent by the Dutch East India Company. They maintain separate cultural practices and speak a creole mixing Malay with Sinhala and Tamil. Both groups follow Sunni Islam, predominantly Shafi'i jurisprudence. Friday prayers define the weekly rhythm. Mosques announce the five daily prayers through loudspeakers, a practice that generated legal challenges resulting in a 2016 agreement limiting volume and hours in mixed neighborhoods.
Islamic daily life follows standard practices: five daily prayers, Friday jummah prayer for men at mosques, dietary halal restrictions, and modest dress codes. The All Ceylon Jamiyyathul Ulama serves as the primary Islamic religious authority, issuing guidance on religious matters and halal certification. Ramadan observance includes pre-dawn meals, daytime fasting, and evening iftar meals often shared communally at mosques. Muslim commercial dominance in the gem trade, particularly in Ratnapura, dates to historical Arab trading networks. This concentration generated economic tensions that erupted in anti-Muslim riots in Aluthgama in 2014 and nationwide violence in 2018, demonstrating how economic and religious identities interweave in Sri Lankan conflicts. The Easter Sunday attacks of April 21, 2019, when Islamic extremists bombed churches and hotels killing 269 people, fundamentally altered Muslim community relations. These attacks prompted military raids, increased surveillance, and social stigmatization affecting Muslims nationwide regardless of individual involvement.
Roman Catholicism arrived with the Portuguese in 1505. Conversion efforts concentrated in coastal areas under Portuguese control, establishing Catholic populations in Jaffna, Mannar, Negombo, and Colombo that persist today. The Dutch period saw persecution of Catholics and promotion of Reformed Protestantism, driving Catholic practice underground and creating a Catholic identity linked to resistance. British rule after 1796 brought religious tolerance and the return of Catholic institutions. The current Catholic population concentrates in the Western Province and Northern Province. Negombo, north of Colombo, holds such a high Catholic concentration it is known as "Little Rome." St. Anthony's Church in Kochchikade, Colombo, attracts devotees from all religious backgrounds seeking miraculous intervention, similar to Kataragama's multi-religious appeal. The church suffered one of the Easter Sunday bombing attacks, being rebuilt and reopened in January 2020.