More than a third of Canadians have no religious affiliation, according to new census data released by Statistics Canada, the nation’s statistical agency. The 34.6% of Canadian “Nones” more than doubles the 16.5% who fell into the same category in 2001, revealing a trend that has yet to plateau.

The agency says the change cannot simply be attributed to a rise in immigration since immigrants to Canada have been disproportionately religious; rather, they attribute at least some of the rise to people raising their kids without organized religion: ...