CaoDai is a universal faith with the principle that all religions have one same divine origin, which is God, or Allah, or the Tao, or the Nothingness, one same ethic based on LOVE and JUSTICE, and are just different manifestations of one same TRUTH.
Three Teachings within Caodaiism are: Buddha, Sage & Saints
The Three Teachings represent hierarchical levels of spiritual attainment, with buddha as the highest. Caodaiism's various stages of spiritual development from human on up are: Thần (angel), Thánh (saint), Tiên (sage), and Phật (buddha). Angels, saints and sages may have, accordingly, extremely long lives in the realms of heaven, but only buddhas are free from the cycle of birth and death.
(I think CaoDaism is a great religion since it is a combination of Christianity, Buddhism, Taoism, Confucianism, Hinduism, Islam, Judaism and other religion. Please post here if you have more words of wisdom on this Religion)