Catholicism at one time dominated almost all of Europe. From Italy, Spain, Hapsburg Empire, England and etc. It was not till the Protestant revolt when areas such as the Germanic states seceded from the Catholic faith, as well as England, Switzerland, Netherlands, etc. Italy, Spain and many South American nations still practice Catholicism devotedly and in large numbers, as well as the United States, and Philippines, and many African nations have a growing Catholic population. Most countries in South and Central America are largely Catholic with Brazil having the largest Catholic population in the world. Catholicism is found in all nations currently, although not overtly in the Muslim states. Please see the link below for a breakdown.
There are practicing Catholics on all continents and in almost all countries. There is no complete data because in some countries people could face severe consequences for admitting they are Christians.
The link gives data for most countries of the world, but it only relates to the number of people who are identifed as Catholics. Whether or not a person practices the religion is open to a very wide interpretation and probably not measurable from country to country.
Actually, there are many countries whose population is mainly Catholic:
1. Almost all countries in Latin America.
2. Italy.
3. Spain;
4. Puerto Rico; etc.
Catholic Answer It's just Catholic, not Roman Catholic. Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is never used by the official Catholic Church.
According to Wikipedia in June 2014, the following countries have populations which self-report as 50% or over Catholic:
The numbers after each country indicate the total population, following by the percent Catholic and the number of Catholics:
Vatican City (details) 921 100% 921
San Marino (details) 29,251 95% 29,230
Andorra (details) 71,201 94% 66,928
Malta (details) 400,214 93.89%[6] 375,761
Cape Verde (details) 516,733 92.64% 478,701
Monaco (details) 32,543 90%[2] 29,288
East Timor (details) 1,040,880 88.84%[6] 924,718
Portugal (details) 10,356,117[41] 88.1%[6] 9,123,739
Paraguay (details) 6,800,000 88%[13] 5,984,000
Italy (details) 59,900,000 87.8%[29] 52,592,200
Equatorial Guinea (details) 700,000-1,700,000 87%.[22] 609,000-1,309,000
Poland (details) 38,501,000 86.7%[40] 33,379,500
Croatia (details) 4,284,889 86.54%[6] 3,708,142
Seychelles (details) 81,188 85%[6] 69,010
Ireland (details) 4,581,269 83.63%[28] 3,831,187
Mexico (details) 112,322,757 82.7%[2] 92,891,000
Peru (details) 30,500,000 81.3%[39] 24,796,500
Philippines (details) 92,337,852 81.06%[6] 74,849,063
Haiti (details) 8,521,622 80.44%[6] 6,817,297
Venezuela (details) 28,946,101 79%[13] 22,800,000
Lithuania (details) 2,944,459 77.2%[32] 2,273,000
Argentina (details) 41,660,000 76.5%[7] 31,870,000
Liechtenstein (details) 33,863 76.2%[2] 25,803
Bolivia (details) 8,857,870 76%[13] 6,740,000
Colombia (details) 47,551,232 75%[13] [17] 35,663,424
Ecuador (details) 15,223,680 74.0%[20][21] 11,265,000
São Tomé and Príncipe (details) 163,000 73.5%[6] 119,805
Belgium (details) 10,364,388 73.1% 7,576,367
Panama (details) 3,339,150 72%[13] 2,400,000
Spain (details) 47,265,321 71.5%[44] 33,794,500
Costa Rica (details) 4,016,173 69%[18] 3,428,205
Dominican Republic (details) 9,105,034 68.9%[19] 6,270,000
Luxembourg (details) 538,000 68.7%[33] 369,600
Burundi (details) 6,370,609 67.29%[6] 4,286,782
Chile (details) 16,572,475 66.65%[16] 11,048,150
Brazil (details) 190,755,799[14][a] 64.63% 123,280,172
France (details) 66,600,000 64%[23] 42,624,000
Austria (details) 8,500,000 62.5%[9] 5,310,000
Slovakia (details) 5,397,036 62%[42] 3,347,277
Dominica (details) 71,540 61.4%[2] 55,000
Saint Lucia (details) 165,600 61.3% 101,500
Cuba (details) 11,163,934 59.66% 6,660,403
Hungary (details) 10,402,000 59.36% 6,174,627
Nicaragua (details) 5,142,098 58.5%[36] 3,008,128
Congo, Republic of (details) 3,686,000 56.11%[6] 2,068,214
Angola (details) 18,498,000 55.59%[6] 10,283,038
Kiribati (details) 98,000 55%[2] 51,000
El Salvador (details) 6,704,932 54%[13] 3,610,000
Slovenia (details) 2,011,070 53.1%[43] 1,068,000
Grenada (details) 89,502 53%[2] 47,436
Gabon (details) 1,389,201 50.05% 695,295
Congo, Democratic Republic of (details) 77,000,000 50%[2] 38,500,000
Catholicism is probably everywhere (that's why it's Catholic), but is predominant in Latin language speaking countries such as Latin America, Spain, Italy, France, and also in Central Europe--Austria, Poland, Hungary, Slovakia. In Asia the Phillipenes and East Timor are predominantly Catholic.
Christianity is mostly practiced in Jamaica,Jamaica is a major country which Christianity is practiced therefore Jamaica is the most popular Christian country.😜
Catholicism.
A major religion practiced in Andorra is Roman Catholicism.
The main religion practiced in Liechtenstein is Catholicism.
Catholicism.
Catholicism
Catholicism.
Roman Catholicism
Roman Catholicism is the most practiced religion in mexico.
No, Catholicism is the most widely practiced religion in Latin America. Protestantism has been growing in the region, but Catholicism remains dominant.
Catholicism.
The best and most practiced religion is Catholicism
The most practiced religion, by far, is Catholicism.