Singapore's immigrants commonly made their religious congregations a form of social organization. From the foundation of the city, colonial authorities had avoided interfering with the religious affairs of the ethnic communities, fostering an atmosphere of religious tolerance. It was characteristic of colonial Singapore that South Bridge Street, a major thoroughfare in the old Chinatown, should also be the site of the Sri Mariamman Temple, a south Indian Hindu temple, and of the Jamae or Masjid Chulia Mosque, which served Chulia Muslims from India's Coromandel Coast. The major religions were Chinese popular religion, commonly although inaccurately referred to as Daoism or Buddhism Hinduism Islam Buddhism and Christianity. Other religions included smaller communities of Sikhs and of Jains from India Parsis, Indians of Iranian descent who followed the ancient Iranian Zoroastrian religion and Jews, originally from the Middle East, who supported two synagogues.

The Chinese practiced Chinese popular religion, a distinctive and complex syncretic religion that incorporates some elements from canonical Buddhism and Daoism but focuses on the worship of gods, ghosts, and ancestors. It emphasizes ritual and practice over doctrine and belief, has no commonly recognized name, and is so closely entwined with Chinese culture and social organization that it cannot proselytize. In Singapore its public manifestations included large temples housing images of deities believed to respond to human appeals for guidance or relief from affliction and use of the common Chinese cycle of calendrical festivals. These occasions included the lunar New Year (in January or February), a festival of renewal and family solidarity Qing Ming (Ching Ming in Wade-Giles romanization), celebrated by the solar calender on April 5th (105 days after the winter solstice), to remember the ancestors and worship at their graves the fifteenth of the fifth lunar month (April or May), in Singapore known as Vesak Day and celebrated as marking the birth of the Buddha the festival of the hungry ghosts in the seventh lunar month, a major Hokkien holiday, marked by domestic feasting and elaborate public rituals to feed and placate the potentially dangerous souls of those with no descendants to worship them and the mid-autumn festival on the fifteenth of the eighth lunar month, an occasion for exchanging gifts of sweet round mooncakes and admiring the full moon. All Chinese temples held one or more annual festivals, marked by street processions, performances of Chinese traditional operas, and domestic banquets to which those who supported the temple, either because of residential propinquity, subethnic affiliation with a particular temple and its deity, or personal devotion to the god, invited their friends and business associates. To prevent the disruption of traffic and preserve public order, the government limited the length and route of street processions and prohibited the use of the long strings of firecrackers that had previously been a component of all Chinese religious display. Some festivals or customs that had li 11f3 ittle religious significance or were not practiced by the southeastern Chinese migrants were promoted by the government's Singapore Tourist Promotion Board for their spectacular and innocuous content. These included the summer dragon boat races, originally held only in China's Chang Jiang (Yangtze) River Valley, and the lantern festival in which paper lanterns in the shape of animals or other objects are carried through the streets by children or, if especially impressive, displayed in parks and temples. In China the lantern festival is celebrated in the first lunar month at the end of the New Year season, but in Singapore it is combined with the mid-autumn festival.

Canonical Buddhism was represented in Singapore as Sinhalese Theravada Buddhism. This form of Buddhism prevails in Sri Lanka and mainland Southeast Asia and differs from the Mahayana Buddhism of China, Korea, and Japan in both doctrine and organization. Theravada Buddhism was brought by Sinhalese migrants from Ceylon (contemporary Sri Lanka), who also influenced the architectural style of Thai and Vietnamese Theravada temples. These latter were staffed by Thai or Vietnamese monks, some of whom were originally members of the overseas Chinese communities of those countries and served a predominantly Chinese laity, using Hokkien, Teochiu, Cantonese, or English. Singapore was also home to a number of Chinese sects and syncretic cults that called themselves Buddhist but taught their own particular doctrines and lacked properly ordained Buddhist monks.

Hindus have been part of Singapore's population since its foundation in 1819, and some of the old Hindu temples, such as the Sri Mariamman Temple, were declared national historical sites in the 1980s and so preserved from demolition. Singapore's Hindus adapted their religion to their minority status in two primary ways--compartmentalization and ritual reinterpretation. Compartmentalization referred to the Hindus tendency to distinguish between the home, in which they maintained a nearly completely orthodox Hindu pattern of diet and ritual observance, and the secular outer world of work, school, and public life, where they did not apply categories of purity and pollution. Singapore lacked the tightly organized caste groups of communities found in India but replaced them in large-scale temple festivals with groups representing those of the same occupation or place of employment. The major Hindu holidays were the Hindu New Year, in April or May Thaipusam, a festival during which penitents fulfilled vows to the deity Lord Subramanya by participating in a procession while carrying kavadi, heavy decorated frameworks holding offerings of milk, fruit, and flowers and Deepavali, the Festival of Lights. Deepavali, a celebration of the victory of light over darkness and hence of good over evil, was a national holiday.

Seven of the ten national holidays were religious festivals two of them were Chinese, two Muslim, two Christian, and one Hindu. The festivals were the Chinese New Year Vesak Day Hari Raya Haji, the Muslim pilgrimage festival Hari Raya Pusa, which marked the end of the fasting month of Ramadan and was a time of renewal Christmas Good Friday and Deepavali. Citizens were encouraged to learn about the festivals of other religious and ethnic groups and to invite members of other groups to their own celebrations and feasts. Public ceremonies such as National Day or the commissioning of military officers were marked by joint religious services conducted by the Inter-Religious Organization, an ecumenical body founded in 1949 to promote understanding and goodwill among the followers of different religions.

Data as of December 1989