The U.S. government estimates the total population is 23.4 million (July 2014 estimate). Based on a comprehensive study conducted in 2005, the Religious Affairs Section of the Ministry of the Interior (MOI) estimates that 35 percent of the population considers itself to be Buddhist and 33 percent Taoist. Although the MOI has not tracked population data on religious groups since the 2005 study, it states this estimate remains largely unchanged. While the majority of religious adherents categorize themselves as either Buddhist or Taoist, many adherents consider themselves to be both Buddhist and Taoist, and many others incorporate the religious practices of other faiths into their religious beliefs.
In addition to organized religious groups, many persons also practice traditional Chinese folk religions, which include some aspects of shamanism, ancestor worship, and animism. Researchers and academics estimate that as much as 80 percent of the population believes in some form of traditional folk religion. Such folk religions might overlap with an individual’s belief in Buddhism, Taoism, Confucianism, or other traditional Chinese religions. There also might be an overlap between practitioners of Buddhism, Taoism, and other traditional Chinese religions with practitioners of Falun Gong, a self-described spiritual discipline. According to the Falun Gong Society of Taiwan, Falun Gong membership exceeds one million in over 1,000 branches island-wide and continues to grow. However, authorities do not track Falun Gong membership statistics, and the Falun Gong Society has acknowledged difficulty in accurately estimating membership within its loose coalition of adherents, many of whom do not meet on a regular basis
Religious groups that total less than 5 percent of the population include I Kuan Tao, Tien Ti Chiao (Heaven Emperor Religion), Tien Te Chiao (Heaven Virtue Religion), Li-ism, Hsuan Yuan Chiao (Yellow Emperor Religion), Tian Li Chiao (Tenrikyo), Universe Maitreya Emperor Religion, Hai Tze Tao, Zhonghua Sheng Chiao (Chinese Holy Religion), Da Yi Chiao (Great Changes Religion), Pre-cosmic Salvationism, Huang Chung Chiao (Yellow Middle Religion), Roman Catholicism, Islam, the Church of Scientology, the Bahai Faith, Jehovah’s Witnesses, the Mahikari Religion, The Church of Jesus Christ of Latter-day Saints (Mormons), and the Unification, Presbyterian, True Jesus, Baptist, Lutheran, Seventh-day Adventist, and Episcopal churches. According to Ministry of Labor statistics or conversations with religious leaders, the majority of the indigenous population of 540,000 (as of October) is Protestant or Roman Catholic. Followers of Judaism number about 200 persons (as of October), and are predominately foreign residents. Some 534,000 migrant workers, primarily from Southeast Asia, differ in religious adherence from the general population. The largest single group of migrant workers is from Indonesia, with a population of approximately 225,000 persons (as of September) who are largely Muslim. Migrant workers from the Philippines – numbering approximately 107,000 persons (as of September) – are predominately Roman Catholic.