Maybe that helps explain why [1] years back jihadis saw Belgium as fertile ground for recruiting. "Belgium: Third of Moroccans feel Muslim, 7% Belgian," from [2] Islam in Europe, June 26:

More than a third of Moroccans in Belgium feel Muslim first, barely 7% identify with the Belgian nationality. Nevertheless, the majority is Belgian, according to a study by the King Baudouin Foundation, reports Belgian newspaper Le Soir. In collaboration with the King Baudouin Foundation, the University of Rabat questioned 400 people from the Moroccan community in Belgium.[...]

Belgian Moroccans prefer a non-mixed marriage. More than half of the respondents thinks it's good to have somebody come from their homeland for a marriage. 62% are against a marriage of a Muslim woman with a non-Muslims. Just 45% disapprove of the reverse.