移民の同化政策を20年研究したオランダの大学教授はイスラム教徒移民の約半数は
コーランを字義通り解釈する原理主義者であり65%が国の法律よりイスラム法が重要と
認識していること等からイスラム教徒の同化は他の場合より困難で同化に成功した西洋社会はひとつもないと結論。

Based on his 20-year-long studies on integration and assimilation,
Ruud Koopmans, a professor of sociology at Humboldt University in Berlin,
has arrived at the conclusion that Muslims are more difficult to integrate than other immigrant groups.

According to Koopmans' data, around 65 percent of the Turkish and Moroccan Muslims in six European countries
consider religious rules to be more important than the secular law of the country in which they live.

Muslims consider themselves separate from other non-Muslim groups,
and refrain from broader interaction with those outside their religion. For instance,
almost 60 percent of the Muslims surveyed rejected the idea of maintaining friendships with homosexuals,
and 45 percent said the same thing about Jews.

https://sputniknews.com/europe/201903061072990112-islam-migration-integration/