Infiltration.

Hugh Fitzgerald from JihadWatch.org hits the nail on the head again...
Unlike refugees from Nazism, or Communism, who hated Nazis and hated Communists, and wanted only to escape from them and, in many cases, to actively work against them, the so-called "refugees" or simply immigrants from Muslim lands bring with them, in their mental baggage, Islam itself. They do not realize that it is Islam, with its inshallah-fatalism and natural support for depotism as opposed to advanced Western democracy (for the belief-system locates legitimacy not in the expressed will of the people, but in the will expressed by Allah in the Qur'an, as glossed by Hadith and Sira). They carry the belief-system with them, and what is more, attempt - not without success -- to spread it about, to make sure that the numbers of adherents of Islam grow and grow and grow. It is this Da'wa, and demographic conquest that is the result of fantastic, utterly unchecked Muslim migration, and the great disparity in birth-rates between Muslims (who often smuggle in plural wives, supported by Infidel taxpayers in their generous welfare payments), and the indigenous non-Muslims, that has, for example, caused the 15,000 Muslims in Holland in 1970 to become 1 million, or 5-7 million Muslims now to burden the educational and justice systems, and the welfare benefits, and the laic state, and social peace, in France, and England, and Germany, and everywhere that Muslims in large numbers have been permitted to settle -- which has led, no clear-sighted Infidel can deny, to a situation far more unpleasant, expensive, and physically dangerous -- and becoming more unpleasant, more expensive, more physically dangerous every day -- for the indigenous Infidels.
This must stop. This suicidal policy cannot continue.
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Guessing the religion of those who plant bombs, hi-jack planes, fire into crowds of civilians, take hostages and murder hostages is the world’s ultimate no-brainer. And yet our leaders, the media and many of us pretend there’s no connection between psychopathic killers and the religion which exalts the slaughter of unbelievers. Islam remains what it was at its beginning, a violent, expansionist faith that will tolerate no competitors. What other religion has the concept of jihad, the notion that if you die fighting for allah you get 72 virgins in paradise? Mohammed started by eliminating the competition, annihilating Jewish tribes in the Arabian Peninsula. More than a 1000 yrs later, it’s still business as usual for his successors. Is islam a religion of peace? Is there an Easter bunny? Can pigs fly? Calling for a war on terror is like trying to stop the bullets instead of stopping the people who are doing the shooting, decades of terror and they still dont get it. Any religious creed that promotes terrorism as a method for the conversion of infidels deserves only contempt and needs to be mocked, crushed, and expelled from the lands it has silently infiltrated. The war is, and needs to be identified without question, against islam and their numbers and attitude warrant exceptional attention...