Christianity is the most adhered to religion in Canada, with 19,373,330 Canadians, or 53.3%, identifying themselves as of the 2021 census. The preamble to the Canadian Charter of Rights and Freedoms refers to God. The French colonization beginning in the 17th century established a Roman Catholic francophone population in New France, especially Acadia and Lower Canada (now Nova Scotia, New Brunswick and Quebec). British colonization brought waves of Anglicans and other Protestants to Upper Canada, now Ontario. The Russian Empire spread Orthodox Christianity in a small extent to the tribes in the far north and western coasts, particularly hyperborean nomads like the Inuit. Orthodoxy would arrive in mainland Canada with immigrants from the eastern and southern Austro-Hungarian Empire and western Russian Empire starting in the 1890s; then refugees from the Soviet Union, Eastern Bloc, Greece and elsewhere during the last half of the 20th century.
Demographics, concentration, and life
The majority of Canadian Christians attend church services infrequently. Cross-national surveys of religiosity rates such as the Pew Global Attitudes Project indicate that, on average, Canadian Christians are less observant than those of the United States but are still more overtly religious than their counterparts in Western Europe. In 2002, 30% of Canadians reported to Pew researchers that religion was "very important" to them. A 2005 Gallup poll showed that 28% of Canadians consider religion to be "very important" (55% of Americans and 19% of Britons say the same). Regional differences within Canada exist, however, with British Columbia and Quebec reporting especially low metrics of traditional religious observance, as well as a significant urban-rural divide, while Alberta and rural Ontario saw high rates of religious attendance. The rates for weekly church attendance are contested, with estimates running as low as 11% as per the latest Ipsos-Reid poll and as high as 25% as per Christianity Today magazine. This American magazine reported that three polls conducted by Focus on the Family, Time Canada and the Vanier Institute of the Family showed church attendance increasing for the first time in a generation, with weekly attendance at 25 per cent. This number is similar to the statistics reported by premier Canadian sociologist of religion, Prof. Reginald Bibby of the University of Lethbridge, who has been studying Canadian religious patterns since 1975. Although lower than in the US, which has reported weekly church attendance at about 40% since the Second World War, weekly church attendance rates are higher than those in Northern Europe.
As well as the large churches — Roman Catholic, United, and Anglican, which together count more than half of the Canadian population as nominal adherents — Canada also has many smaller Christian groups, including Orthodox Christianity. The Egyptian population in Ontario and Quebec (Greater Toronto in particular) has seen a large influx of the Coptic Orthodox population in just a few decades. The relatively large Ukrainian population of Manitoba and Saskatchewan has produced many followers of the Ukrainian Catholic and Ukrainian Orthodox Churches, while southern Manitoba has been settled largely by Mennonites. The concentration of these smaller groups often varies greatly across the country. Baptists are especially numerous in the Maritimes. The Maritimes, prairie provinces, and southwestern Ontario have significant numbers of Lutherans. Southwest Ontario has seen large numbers of German and Russian immigrants, including many Mennonites and Hutterites, as well as a significant contingent of Dutch Reformed. Alberta has seen considerable immigration from the American plains, creating a significant Mormon minority in that province. The Church of Jesus Christ of Latter-day Saints claimed to have 178,102 members (74,377 of whom in Alberta) at the end of 2007. And according to the Jehovah's Witnesses year report there are 111,963 active members (members who actively preach) in Canada.
Canada as a nation is becoming increasingly religiously diverse, especially in large urban centres such as Toronto, Vancouver, and Montreal, where minority groups and new immigrants who make up the growth in most religious groups congregate. Two significant trends become clear when the current religious landscape is examined closely. One is the loss of 'secularized' Canadians as active and regular participants in the churches and denominations they grew up in, which were overwhelmingly Christian, while these churches remain a part of Canadians' cultural identity. The other is the increasing presence of ethnically diverse immigration within the religious makeup of the country.