This is a list of religious populations by number of adherents and countries. Adherents in 2020 Notes By proportion Christians Countries and territories with the greatest proportion of Christians from Christianity by country, : 100% (100% Roman Catholic) 100% (100% Seventh-day Adventist) ~99% (mostly Protestant) 99.6% (mostly Roman Catholic) 98.5% (96% Armenian Orthodox Apostolic) 98.3% (mostly Protestant) 98.1% (mostly Roman Catholic) 98% (71% Roman Catholic) 98% (95% Greek Orthodox) 97.2% (mostly Protestant) 97.2% (mostly Protestant) 97% (~97% Roman Catholic) 96.9% (mostly Roman Catholic) 96.4% (mostly Roman Catholic) 96% (mostly Protestant) ~96% (mostly Protestant) 95.1% (mostly Protestant) 94.8% (mostly Protestant) 94.6% (mostly Roman Catholic) 94.51% (mostly Roman Catholic) 93% (mostly Romanian Orthodox) 92.9% (mostly Roman Catholic) 91.1% (mostly Roman Catholic) 90% (mostly Roman Catholic) Muslims Countries with a considerable proportion of Muslims from Islam by country , excluding foreign workers in brackets: Data is based on the Pew Forum on Religion and Public Life 100% 100% ~100% Gaza Strip 99.9% 99.9% 99.8% (65% Sunni 33.5% Zaydi 1.5% Ismaili) 99.7% (90% Sunni 10% Shi'a) 99.6% (95% Shi'a, 5% Sunni) 99.5% 99.2% (Shi'a) 99% (67% Shi'a, 33% Sunni) 99% (mostly Sunni) 98.6% (85% Sunni, 15% Shi’a) 98.3% 98% 97.2% (90% Sunni, 10% Shi'a) 97% 96.9% 96.6% 96.4% (85% Sunni 12% Shi'a 3% Other) 90.4% 89.3% 86.7% 61.3% 53.5% 41% Irreligious and atheistsCountries with the greatest proportion of people without religion, including agnostics and atheists, from Irreligion by country (): (78.4%) (71.3%) (60.2%) (60%) (54.7%) (51.8%) (46.6%) (45.3%) (44.3%) (41.5%) (39.6%) (36.5%) (35.5%) (31.9%) (31.2%) (31%) (29.9%) (29%) (28.6%) (28.6%) (28%) (26.7%) (26.3%) (23.9%) (23.2%) (22.8%) (20.8%) (20%) (18.8%) Data is ranked by mean estimate in parentheses. Irreligious includes agnostic, atheist, secular people, and those having no formal religious adherence. It does not necessarily mean that those of this group don't belong to any religion. Some religions have harmonized with local cultures and can be seen as a cultural background rather than a formal religion. Additionally, the practice of officially associating a family or household with a religion, while not formally practicing the affiliated religion, is common in many countries. Thus, over half of this group is theistic and/or influenced by religious principles, but nonreligious/non-practicing and not true atheists or agnostics. See Spiritual but not religious. HindusCountries with the greatest proportion of Hindus from Hinduism by country : 81.3% 79.8% 48.54% 27.9% 25% 24.8% 22.3% 18.2% 15% 12.6% 12% 9.6% 8.1% 6.7% 6.3% 5.1%