How many Christians are in the world?
Christianity by country
Christianity in multiple forms is the state religion of the following 15 nations: Argentina (Catholic Church),[9] Armenia (Armenian Apostolic Church), Tuvalu (Church of Tuvalu), Tonga (Free Wesleyan Church of Tonga), Costa Rica (Catholic Church),[10] Kingdom of Denmark (Danish National Church),[11] England (Church of England),[12] Greece (Eastern Orthodox Church), Georgia (Eastern Orthodox Church),[13][14] Iceland (Church of Iceland),[15] Liechtenstein (Catholic Church),[16] Malta (Catholic Church),[17] Monaco       
(Catholic Church),[18] Vatican City (Catholic Church),[19] and Zambia.[20]