The Catholic Church took Newfoundland to court after the Government acted on the result not one but two referendums (the 2nd time with 73% Yes) where voters chose to replace the Archaic Church Run but Government Funded denominational school system with a modern secular school system. The courts found that decision constitutional. 

https://www.thestar.com/news/2007/09/16/newfoundland_offers_religious_school_lessons.html

One seventh of Ontarion lands used to be held in a Clergy Reserve under the constitution act of 1791. Among other problems that hindered economic development. 

Stupid provisions in Constitutions can be changed or reinterpreted by courts in the light of the current secular majority in Canada.

https://en.wikipedia.org/wiki/Clergy_reserve