Singapore tops religious diversity; global trends show Christians largest, Muslims fastest-growing, Hindus near 15%

Singapore ranks as the world’s most religiously diverse nation in a 2026 study by Pew Research Center, scoring 9.3 on its Religious Diversity Index. Covering 201 countries and drawing on 2,700 censuses, the report tracks global shifts: Christians remain largest, Muslims grow fastest, the unaffiliated reach 24.2%, and Asia-Pacific emerges most diverse regionally.