Brussels’ metropolitan area is a quarter Muslim. The number of Muslims in Brussels—where roughly half of the number of Muslims in Belgium currently live—has reached 300,000, which means that the self-styled “Capital of Europe†is now one of the most Islamic cities in Europe.In 2013, Muslims made up approximately 26% of the population of metropolitan Brussels, followed by Rotterdam (25%), Amsterdam (24%), Antwerp (17%), The Hague (14%) and Utrecht (13%), according to a panoply of research. That means Jewish kindergartens are in trouble in a city with a growing dominance by the Master Faith. A Belgian insurance company has refused...