A good chunk of them have already been converted into condos and shops. I even hooked up with a guy that lived in one of those.
Christianity died in the 70s in Québec, you won't find many people under like 40 that still gives a crap about religion in Québec.
A lot of those identify as christian because of cultural heritage and because it's the "not some brown people's religion" but are non-practicing or straight up non-believers otherwise. Those that do maybe go in the church once a year for the christmas stuff
The churches are packed with mostly tourists and the parking lot is filled with Ontario plates.
You're just not gonna find many nutjobs like the rest of Canada and the US here. Even my grandparents pretty much just go out of habit from the old times. I haven't once been in a religious argument in Québec my whole life. It's basically unavoidable in the US.
The quiet revolution is a fairly interesting piece of history.