I'm not sure what to make of this other than to conclude that neither open-ended multiculturalism nor mandated assimilation works well.  There is one model that seems to work better than others, however, and that's the one in the United States, where immigrants are permitted to retain their own cultural practices provided their primary allegiance is to their new country. I believe that one (pre-Trump) study indicated that about 8 in 10 Muslims were either happy or very happy to be in the U.S., while, on the other hand, a 2016 study indicated that 61 percent of Canadian Muslims identified primarily as being Muslim rather than Canadian, suggesting that our open-ended brand of multiculturalism, which demands little of immigrants, is less successfully integrative than is the more compelling American "melting pot" model.