The data from Quebec is not entirely accurate as many people put down that they are Catholic despite not having gone to church in years.

The most recent count by Piper’s group found that of 2,751 places of worship — of all denominations — in the province inventoried in 2003, about 965 of them, or 35 per cent, were listed as being “in mutation,” meaning they had been closed, demolished, sold or had found new uses.

https://globalnews.ca/news/11662734/quebec-church-funding-secularism/