Beliefs, customs, and rituals form the symbolic infrastructure of culture. They transmit values, coordinate collective action, mark life‑cycle transitions, and make the social world feel meaningful and predictable. Drawing on classic and contemporary scholarship from anthropology, sociology, religious studies, and cultural psychology, this paper synthesizes how beliefs (shared truth-claims and value commitments), customs (conventionalized practices), and rituals (formalized, rule-governed sequences of action imbued with symbolism) interrelate to produce cultural continuity and change. After clarifying definitions and theoretical lineages (Durkheim, Mauss, Van Gennep, Turner, Douglas, Geertz), I outline key mechanisms—symbolic condensation, performativity, effervescence, embodiment, and social sanction—through which these cultural forms shape cognition and social structure. Cross‑cultural case studies from South Asia, Sub-Saharan Africa, East Asia, Oceania, Europe, and the Americas illustrate how similar ritual logics take divergent expressions depending on ecology, power, and historical encounter. The paper also assesses modern transformations—including secularization, commodification, digital mediation, and diasporic hybridization—that reconfigure ritual authority and invent new “ritual-like” forms (sports fandom, national ceremonies, platformed grief). Finally, I propose an integrated analytic framework—the BCR Model (Beliefs–Customs–Rituals)—that maps flows among propositional meanings, habitual practices, and symbolic performances across micro, meso, and macro levels. Implications for intercultural competence, policy, education, and conflict mitigation are discussed, with recommendations for future research into ritual datafication and embodied measures of cultural participation.