Leftists who have fully supported Bill 101 shouldn't have a problem with Bill 21 either. It is to preserve the culture of Quebec. Language is the primary tool protecting that culture but it isn't the only one.
Having English words visible in Quebec is a threat to the culture. Of course non-Catholic religious symbols are a problem. They are a visible manifestation of a non-Quebec culture. They threaten the cultural face of Quebec.
I take it this racist drivel is meant as sarcasm.