History & Antiquity1 CE–2025
Major Religions by Followers
Two thousand years of belief as a race for followers. Folk faiths and Hinduism open the story; Christianity is adopted by Rome, Islam spreads explosively after 632, and the twentieth century's great surprise is the rise of the religiously unaffiliated. Counts are reconstructions, so read the shape, not the decimals.
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Source: Pew Research Center; historical estimates from Barrett's World Christian Encyclopedia and demographers Illustrative: pre-modern adherent counts are scholarly reconstructions; modern figures follow Pew's Global Religious Landscape and 2020-2025 projections. illustrative data Updated 2026-07-03