Via the New York Times:
(...)
European countries could use a period of benign neglect of the Islam issue — but only after they finish incorporating religion into the national fabric. For too long, they have instead masked an absence of coherent integration policy under the cloak of “multiculturalism.” The state outsourced the hard work of integration to foreign diplomats and Islamist institutions — for example, some students in Germany read Saudi-supplied textbooks in Saudi-run institutions.
This neglect of integration helped an unregulated “underground Islam” to take hold in storefronts, basements and courtyards. It reflected wishful thinking about how long guest workers would stay and perpetuated a myth of eventual departure and repatriation.(source)
