The data above is excerpted from the 2011 National Household Survey.
The NHS was created to recover some of the data loss resulting from the Conservative government’s scrapping of the long-form census. It is a survey, not a census, though it was done by Statistics Canada at the time of the 2011 census.
Because it was an optional survey, and not mandatory as the census is, the response rate was only 68%, compared to 94% when the same data was collected as part of the census. This means that one must be a little wary about comparing the data from the NHS with previous census data.
Generally, though, major problems only arise when looking at tightly localized data – either localized geographically, or by some other means (such as very specific ethnic groups) – so the data is most suspect when you try to look for information at the regional level, or when looking at very small groups. That means that the nation-wide religion data used above should be pretty safe. Nevertheless, you have been warned.
Most of the data above comes from the data table titled “Religion (108), Immigrant Status and Period of Immigration (11), Age Groups (10) and Sex (3) for the Population in Private Households of Canada, Provinces, Territories, Census Metropolitan Areas and Census Agglomerations, 2011 National Household Survey”, with StatsCan catalogue number 99-010-X2011032.
Additional commentary from StatsCan about the data can be found in their analytical document “Immigration and Ethnocultural Diversity in Canada” – specifically the section titled “Religions in Canada”.
The percentages from the 2001 census come from StatsCan catalogue number 96F0030XIE2001015, retrieved via the Wikipedia page “Demographics of Canada” on .
See also my related Canadian Atheist post “2011 National Household Survey religion results”.