Cao Đài (Vietnamese: Cao Đài (help·info)) is a relatively new, syncretist, monotheistic religion, officially established in the city of Tây Ninh, southern Vietnam, in 1926. Đạo Cao Đài is the religion's shortened name, the full name is Đại Đạo Tam Kỳ Phổ Độ (Great Religion [of The] Third Period [of] Revelation [and] Salvation). The term Cao Đài literally means "Kingdom of Heaven." Figuratively, it means that highest place where God reigns. Caodaiists often use the term Đức Cao Đài (Venerable Cao Dai) as the abbreviated name for God, the creator of the universe, whose full title is Cao Đài Tiên Ông Đại Bồ Tát Ma-ha-tát (translation: Cao Dai [the] Ancient Sage [and] Great Bodhisattva Mahasattva). According to Caodaiists, the full title was purposefully chosen by God because within it are representations of the Three Teachings: Saint, Sage and Buddha.
Adherents engage in ethical practices such as prayer, veneration of ancestors, nonviolence, and vegetarianism with the minimum goal of rejoining God the Father in Heaven and the ultimate goal of freedom from the cycle of birth and death. Estimates of the number of Cao Đài adherents in Vietnam vary, but most sources give 2 to 3 million. Some estimates are as high as 8 million adherents in Vietnam. An additional 30,000 (numbers may vary) (primarily ethnic Vietnamese) live in the United States, Europe, and Australia.
According to Cao Dai, before God existed, there was the Tao, the nameless, formless, unchanging, eternal source referenced in the Tao Te Ching. Then, a Big Bang occurred, out of which God was born (emanationism). The universe could not yet be formed and to do so, God created yin and yang. He took control of yang and shed a part of himself, creating the Goddess to preside over yin. In the presence of yin and yang, the universe was materialized. The Goddess is, literally, the mother of the myriad of things in the Universe. Thus, Caodaiists worship not only God, the father, but also the Goddess, literally referred to as the Mother Buddha. Note that God's importance and role is higher than that of the Mother Buddha. Also, the Mother Buddha, as are all buddhas, is a part of Yang, and therefore, is male. Yin is the female side, and the Mother Buddha only oversees Yin, but is not a part of Yin.
The Tây Ninh Holy See recognizes three main scriptures:
God is symbolized by the Divine Eye, specifically the left eye because Yang is the left side and God is the master of Yang.
In the order of most to least difficult, the Three Teachings within Caodaiism are:
Jesus is regarded as a Buddha and true Son of God, shed directly from God.
Caodaiism's organizational structure closely resembles that of many governments of democracies. Caodaiism's governing body consists of three branches that are functionally equivalent to the U.S.'s legislative, executive and judicial branches: Cửu Trùng Đài, Hiệp Thiên Đài and Bát Quái Đài.