Is Buddhism the only major world religion currently experiencing a decline in global followers?

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Buddhism remains a significant global faith, practiced by approximately 320 million people worldwide. Yet, recent data suggests a unique trend: it is the only major religion that saw a decline in its total number of adherents between 2010 and 2020. Understanding this shift requires looking at its diverse regional branches.

As of 2020, Buddhism accounts for 4.1% of the global population. While the religion maintains a strong presence, the Pew Research Center identified it as the sole faith group to experience a contraction during the decade spanning 2010 to 2020. This statistical decline highlights the complex ways in which religious affiliation is measured and reported across different cultural landscapes.

The practice of Buddhism is not monolithic; it is divided into distinct schools that dominate specific geographic regions. Mahayana Buddhism stands as the largest branch, claiming roughly 53% of all Buddhists and maintaining a heavy concentration throughout East Asia. In contrast, Theravada Buddhism serves as the primary tradition for approximately 36% of the global Buddhist population, with its influence centered in Sri Lanka and Mainland Southeast Asia.

Beyond these major branches, the distribution of the faith is deeply tied to national identity. Thailand currently holds the largest share of the global Buddhist population by sheer numbers. Furthermore, the religion holds a formal status as the state religion in three specific nations: Cambodia, Bhutan, and Sri Lanka. While these regions remain strongholds, smaller schools, such as Navayana, maintain a presence in India, though their following remains relatively scant compared to the major traditions.

The study of Buddhist demographics relies on various international assessments, including reports from the Pew Research Center and data referenced by the US State Department and the CIA FactBook. These sources provide the framework for understanding how a religion that once spanned vast territories now navigates a changing global landscape. Whether this decline represents a permanent shift or a temporary fluctuation in reporting remains a subject of ongoing demographic analysis.

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