Caodaism presents itself as a universal path, and its doors are not limited by ethnicity or nationality. Non‑Vietnamese seekers are understood as equally “children of the same Supreme Being,” and communities, especially in the diaspora, explicitly welcome them. The main barriers tend to be cultural and linguistic rather than doctrinal, since much of the liturgy and scripture is in Vietnamese. Nonetheless, the religion’s emphasis on the unity of all traditions naturally lends itself to receiving adherents from diverse backgrounds.

For those drawn to this path, “conversion” is less a single dramatic event and more an unfolding commitment to Caodai belief and practice. Typically, a newcomer studies the basic teachings: faith in one Supreme Being (Cao Đài), acceptance of Caodai saints and the Third Era of Religious Salvation, and respect for the major world religions as converging ways to the same Divine Source. This intellectual and spiritual preparation is usually accompanied by conversations with temple dignitaries, who record the person as a lay follower and may guide them in how to live out the faith in daily life. In some communities, a brief vow or oath is taken before the altar, making explicit a pledge to follow Caodai principles.

Ethical and devotional disciplines gradually become the fabric of belonging. Converts are encouraged to cultivate compassion, truthfulness, and moral restraint, while avoiding intoxication and serious misconduct. Vegetarian practice—either full or periodic—plays a significant role, and many are guided to adopt it in a way that is sustainable for them. Prayer and participation in temple ceremonies, often centered on the Divine Eye symbol, help root the new adherent in the rhythm of Caodai worship. Over time, daily or periodic prayers and meditation become a concrete expression of the inner orientation toward Cao Đài.

For some, the journey continues into deeper forms of service. Those who feel called to become dignitaries undertake more extensive training and accept stricter disciplines, such as strict vegetarianism, celibacy for certain ranks, and specific dress codes, always under the discernment and approval of the religious hierarchy. Across all levels of commitment, the actual procedures and expectations can vary from one temple or branch to another, especially between communities in Vietnam and those abroad. Yet the underlying pattern remains consistent: sincere acceptance of Caodai teachings, a formal acknowledgment of faith within a temple community, and a steady integration into its ritual and ethical life.