 The Cao Đài faith ( "Way of the Highest Power") is an organised monotheistic Vietnamese folk religion formally established in the city of Tây Ninh in southern Vietnam in 1926.The full name of the religion is Đại Đạo Tam Kỳ Phổ Độ ("Great Way [of the] Third Time [of] Redemption").Followers also call their religion Đạo Trời ("Way of God").Cao Đài has common roots and similarities with the Tiên Thiên Đạo doctrines.