Vietnamese Caodaism is a syncretic faith that blends aspects of many faiths and traditions, including Buddhism, Taoism, Confucianism, Catholicism, spiritism, and traditional folk beliefs. It quickly rose to become the third biggest faith in Vietnam after its official establishment in 1926 in Tay Ninh province in the south. Today, there are about 5 million adherents. A brief history, philosophies, doctrines, worship rituals, and architectural aesthetics of Caodaism are presented in this article. It talks about how its worldview incorporates Buddhist ideas of karma and rebirth, how its socioreligious structure is shaped by Confucian ethics and propriety, and how its rituals and accessories reflect Taoist Yin-Yang beliefs. The doctrine of the Supreme Being, which echoes God the Heavenly Father, the liturgical structure of Caodaism, and the ecclesiastical hierarchy all show Catholic influences. Voodoo and the veneration of guardian deities are important tenets of traditional Vietnamese religion. Tay Ninh Holy See, a complex of temples that blends European and Asian architectural styles, is a synthesis of these many elements. Sacred yearly activities at this headquarters site include memorial services for revered individuals as well as group ceremonies of introspection and moral reaffirmation that revitalise believers on a spiritual level. Caodaism, with its distinctive character that combines Eastern philosophy with Western practises, is now widely practised thanks to official acceptance and international missions. The moral rebirth and cross-cultural appeal of this fusion religion are significant across growing international networks, even as Vietnam undergoes modernization.