This isn’t to say that there aren’t problems with Muslim immigrant populations in parts of Europe, especially France, Germany and Holland. But in every case, the troubles can be traced to one of three causes: fallout from past colonial relationships; domestic policies that hinder the ability of immigrants to work, to worship and to naturalize; or the particular character of the immigrant community and how it interacts with the host country. So, Bangladeshis and Pakistanis in London are not the same as North Africans in Paris or Somalis in Ottawa. But regardless of how these isolated problems are (or are not) resolved, the key point is that they have virtually nothing to do with a grand Islamic takeover project.
That's from my review of Doug Saunders' new book, The Myth of the Muslim Tide.