Catholicism and Quebec nationalism have a pretty incredible history, but I would say it's pretty far from the truth to align today's sovereigntists with the Catholic church and conservatism.
The
Quiet Revolution was a secular, nationalist reaction to the fact that all power in Quebec was held by a conservative Anglo-Catholic coalition. When Duplessis died in 1959, the province went through a profound change.
Quebec went - almost overnight - from one of the most religious to the most secular societies on earth and the sovereignty movement was born during that transition.