The U.S. government estimates the total population at 23.6 million (midyear 2020 estimate). According to a survey by the Academia Sinica’s Institute of Sociology released in 2019, 49.3 percent of the population practices exclusively traditional folk religions, 14 percent practices Buddhism, and 12.4 percent practices Taoism, with 13.2 percent identifying as nonbelievers. The rest of the population mainly consists of Protestants (5.5 percent), I-Kuan Tao (2.1 percent), Catholics (1.3 percent), and other religious groups, including Sunni Muslims, Tien Ti Chiao (Heaven Emperor Religion), Tien Te Chiao (Heaven Virtue Religion), Li-ism, Hsuan Yuan Chiao (Yellow Emperor Religion), Tian Li Chiao (Tenrikyo), Pre-cosmic Salvationism, the Church of Scientology, the Baha’i Faith, Jehovah’s Witnesses, the Mahikari religion, The Church of Jesus Christ of Latter-day Saints, and the Family Federation for World Peace and Unification (Unification Church).

Some studies found that as many as 80 percent of religious practitioners combine multiple faith traditions. Many adherents consider themselves both Buddhist and Taoist, and many individuals also incorporate some aspects of traditional folk religions, such as shamanism, ancestor worship, and animism, into their belief in Buddhism, Taoism, Confucianism, or other religions. Some practitioners of Buddhism, Taoism, and other religions also practice Falun Gong, a self-described spiritual discipline. According to the leadership of the Falun Gong Society of Taiwan, Falun Gong practitioners number in the hundreds of thousands.

According to recent MOL statistics, the Council of Indigenous Peoples, and religious leaders, the majority of the indigenous population of 575,000 is Protestant or Roman Catholic. There are an estimated 1,000 Jews, approximately half of whom are foreign residents. There are an estimated 699,000 foreign workers, primarily from Southeast Asia. The largest single group of foreign workers is from Indonesia, consisting of approximately 267,000 persons, who are predominantly Muslim. Workers from the Philippines – numbering approximately 153,000 persons – are predominately Roman Catholic.