Why is Buddhism declining while other faiths shift south? Explore how demographic changes and secularization are rewriting the story of modern faith.

We are moving from a world of inherited faith to a world of negotiated faith; whether it’s through a court case, a TikTok video, or a conversation at the dinner table, we are all now in the business of negotiating what is sacred.
The Religious Diversity Index is a mathematical scale developed by the Pew Research Center to measure how evenly a population is divided among different religious groups. Borrowing formulas from ecology and economics, the index scores countries from zero to ten. A score of zero represents a complete religious monoculture, while a perfect ten would indicate a population split exactly evenly between seven major categories: Christians, Muslims, Hindus, Buddhists, Jews, the religiously unaffiliated, and "others." Currently, Singapore holds the highest RDI in the world with a score of 9.3.
Buddhism is experiencing a unique decline primarily due to massive generational shifts and demographic trends in East Asia. In countries like Japan and South Korea, over 40% of people raised Buddhist now identify as religiously unaffiliated, often trading traditional practices like family altars for secular or digital alternatives. Furthermore, many countries with high Buddhist populations, such as China and Thailand, have fertility rates well below the replacement level, meaning their populations are shrinking compared to the rapid growth seen in highly religious regions like Sub-Saharan Africa.
"Nones" is a term used to describe the religiously unaffiliated, a diverse group that includes atheists, agnostics, and those who identify as "nothing in particular." The primary driver for joining this group is a lack of belief, with about 51% of those who left their childhood religion stating they simply stopped believing in the teachings. Other major factors include a gradual "drift" away from faith during young adulthood (typically before age 30), a lack of trust in religious institutions or leaders, and the belief that one can be a moral person without being a member of a religious organization.
Research shows that the "vibe" of a household is a stronger predictor of religious retention than the mere performance of rituals. In households with high religious activity and a "mostly positive" experience, approximately 84% of children stay in their faith as adults. Conversely, if the experience is perceived as negative or restrictive, only about 24% remain affiliated. Additionally, the window between ages 18 and 30 is considered a critical period; 85% of people who decide to switch or leave their religion do so before they turn 30.
Heritage religion, or "belonging without believing," occurs when secular individuals invoke religious symbols or traditions as markers of national or cultural identity rather than out of theological conviction. This trend is particularly visible in Europe and Russia, where people may defend the presence of crucifixes or church bells as "national markers" against perceived external threats like immigration. In these cases, religion functions as a cultural "uniform" for a team, even if the individuals involved do not participate in the actual religious worship or subscribe to the underlying doctrines.
Creado por exalumnos de la Universidad de Columbia en San Francisco
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Creado por exalumnos de la Universidad de Columbia en San Francisco
