Top 25 Countries with the Lowest Religious Affiliation in 2025China Dominates as the Least Religious CountryIn 2025, China leads as the nation with the highest percentage of religious disaffiliation, with approximately 89.6% of its population identifying as atheist, agnostic, or non-religious. North Korea: A Highly Secular SocietyFollowing closely, North Korea exhibits a deeply secular society, with nearly 73% of its population reporting no religious affiliation. Czechia Continues Its Secular TrendCzechia, known for its rich history of religious upheaval, remains one of the least religious countries in 2025, with about 72.8% of residents reporting no religious belief. Oceania’s Changing Religious LandscapeNew Zealand (51.4%) and Australia (42.3%) continue to embrace secular identities, influenced by diverse immigrant populations and emphasis on individualism over traditional religious adherence. Countries once deeply rooted in religious traditions are experiencing transformation, reshaping cultural identities and influencing global trends.