Christianity is the majority in the following nations:
Pitcairn Islands (details) 50 100.0%
Vatican City (details) 2,800 100.0%
Greece (details) 11,204,000 99.7%
Romania (details) 20,930,000 99.5%
Papua New Guinea (details) 6,800,000 99.2%
Ecuador (details) 14,099,000 99.0%
Armenia (details) 3,250,000 98.7%
Equatorial Guinea (details) 683,000 98.6%
East Timor (details) 1,152,000 98.4%
American Samoa (details) 70,000 98.3%
Moldova (details) 3,503,000 98.3%
Malta (details) 408,000 98.0%
Venezuela (details) 28,340,000 98.0%
Colombia (details) 44,502,000 97.6%
Zambia (details) 12,939,000 97.6%
Guatemala (details) 14,018,000 97.5%
Mexico (details) 107,095,000 97.5%
Grenada (details) 101,000 97.3%
Bolivia (details) 9,730,000 97.0%
Puerto Rico (details) 3,878,000 97.0%
San Marino (details) 31,000 97.0%
Paraguay (details) 6,260,000 96.9%
Greenland (details) 55,000 96.6%
Bahamas (details) 350,000 96.3%
British Virgin Islands (details) 23,000 96.0%
Poland (details) 36,526,000 95.7%
Congo, Democratic Republic of (details) 68,558,000 95.6%
Micronesia, Federated States of (details) 106,000 95.4%
Dominican Republic (details) 9,734,000 95.2%
Barbados (details) 244,000 95.0%
Cape Verde (details) 487,000 95.0%
Iceland (details) 300,000 95.0%
Portugal (details) 10,110,000[31] 94.7%
Seychelles (details) 80,000 94.7%
Cook Islands (details) 19,000 94.3%
Falkland Islands (details) 3,000 94.3%
Ireland (details) 4,220,000 94.1%
Faroe Islands (details) 46,000 94.0%
Peru (details) 27,635,000 93.8%
Rwanda (details) 9,619,000 93.6%
Serbia (details) 9,138,000 93.5%
Philippines (details) 90,530,000 93.1%
Argentina (details) 37,561,000 92.7%
Croatia (details) 4,107,000 92.6%
Panama (details) 3,057,000 92.0%
Ukraine (details) 41,973,000 91.5%
Congo, Republic of (details) 3,409,000 90.7%
Anguilla (details) 15,000 90.5%
Brazil (details) 175,501,000 90.4%
Aruba (details) 98,000 90.1%
Andorra (details) 78,000 90.0%
Angola (details) 17,094,000 90.0%
Lesotho (details) 1,876,000 90.0%
Namibia (details) 1,991,000 90.0%
Nicaragua (details) 5,217,000 89.6%
Dominica (details) 59,000 88.7%
Georgia (details) 3,930,000 88.6%
Uganda (details) 29,943,000 88.6%
Italy (details) 53,230,000[30] 87.8%
Liechtenstein (details) 32,000 87.8%
Monaco (details) 29,000 87.7%
Honduras (details) 6,660,000 87.6%
Chile (details) 14,930,000 87.2%
Luxembourg (details) 437,000 87.0%
Slovakia (details) 4,730,000 86.5%
Norway (details) 4,195,000 85.6%
Kenya (details) 34,774,000 85.1%
Cuba (details) 9,523,000 85.0%
Zimbabwe (details) 10,747,000 85.0%
Lithuania (details) 2,827,000 84.9%
Costa Rica (details) 3,912,000 84.3%
Bulgaria (details) 6,364,000 84.0%
Haiti (details) 8,527,000 83.7%
Denmark (details) 4,610,000 83.1%
Austria (details) 6,970,000 83.0%
Hungary (details) 8,260,000 82.7%
Swaziland (details) 994,000 82.7%
El Salvador (details) 5,073,000 81.9%
South Africa (details) 40,243,000 81.7%
Finland (details) 4,347,000 81.0%
Tonga (details) 84,000 81.0%
Belarus (details) 8,600,200 80.0%
Malawi (details) 12,538,000 79.9%
Slovenia (details) 1,610,000 79.8%
Cyprus (details) 863,000 79.3%
Switzerland (details) 6,172,000 79.3%
Spain (details) 38,568,000 79.2%
Montenegro (details) 500,000 78.8%
Germany (details) 58,400,000 77.9%
Palau (details) 16,000 77.9%
Canada (details) 26,401,000 77.1%
Belize (details) 247,000 76.7%
South Sudan (details) 6,250,000 76.2%
Burundi (details) 7,662,000 75.0%
Antigua and Barbuda (details) 66,000 74.0%
Cayman Islands (details) 42,000 73.8%
Sweden (details) 7,148,000 73.0%
United States (details) 229,220,000 73.0%
Australia (details) 16,345,000 72.3%
Gabon (details) 1,081,000 72.0%
Botswana (details) 1,416,000 71.6%
United Kingdom (details)[35] 42,079,000 71.58%
Russia (details) 105,775,000 70.3%
Cameroon (details) 13,390,000 69.0%
Ghana (details) 16,741,000 68.8%
Bermuda (details) 46,000 67.0%
Jamaica (details) 1,784,000 65.3%
Macedonia, Republic of (details) 1,334,000 65.1%
Ethiopia (details) 54,978,000 64.5%
Belgium (details) 6,860,000 64.1%
France (details) 41,000,000 64%
Lebanon (details) 2,995,000 63.0%
Eritrea (details) 3,310,000 62.9%
Tanzania (details) 27,118,000 62.0%
New Zealand (details) 2,926,000 61.3%
Uruguay (details) 2,127,000 58.4%
Fiji (details) 498,000 58.3%
Trinidad and Tobago (details) 774,000 57.6%
Netherlands (details) 9,350,000 57.4%
Latvia (details) 1,280,000 57.2%
Guyana (details) 434,000 57.0%
Mozambique (details) 13,120,717 56.1%
Bosnia and Herzegovina (details) 2,120,000 52.0%
Nigeria (details) 80,103,000 51.2%
Central African Republic (details) 2,302,000 51.0%
Kazakhstan (details) 8,152,000 51.0%
Suriname (details) 308,000 50.3%
The map at the Wiki page shows that Christianity is doing pretty well for itself outside of the Middle East, Asia and parts of Northern Africa.
So no, Christianity isn’t everywhere… But it’s in a shitload of places. Yet not the place where the religion first started! I find this interesting. Don’t you?