Though divided by their common creed - Shiites vs. Sunnites vs. Wahabbites and so on - the Muslims of Europe are united in supporting the Palestinian cause and in opposing the Iraq war. This - and post-colonial guilt feelings, especially manifest in France and Britain - go a long way toward explaining Germany's re-discovered pacifistic spine and France's anti-Israeli (not to say anti-Semitic) tilt. Moreover, the Muslims have been playing an important economic role in the continent since the early 1960s. Europe's postwar miracle was founded on these cheap, plentiful and oft-replenished Gastarbiter - "guest workers". Objective studies have consistently shown that immigrants contribute more to their host economies - as consumers, investors and workers - than they ever claw back in social services and public goods. This is especially true in Europe, where an ageing population of early retirees has been relying on the uninterrupted flow of pension contributions by younger laborers, many of them immigrants. Business has been paying attention to this emerging market. British financial intermediaries - such as the West Bromwich Building Society - have recently introduced "Islamic" (interest-free) mortgages. According to market research firm, Datamonitor, gross advances in the UK alone could reach $7 billion in 2006 - up from $60 million today. The Bank of England is in the throes of preparing regulations to accommodate the pent-up demand. Yet, their very integration, however hesitant and gradual, renders the Muslims in Europe vulnerable to the kind of treatment the old continent meted out to its Jews before the holocaust. Growing Muslim presence in stagnating job markets within recessionary economies inevitably generated a backlash, often cloaked in terms of Samuel Huntington's 1993 essay in Foreign Affairs, "Clash of Civilizations". Even tolerant Italy was affected. Last year, the Bologna archbishop, Cardinal Giacomo Biffi, cast Islam as incompatible with Italian culture. The country's prime minister suggested, in a visit to Berlin two years ago, that Islam is an inherently inferior civilization. Oriana Fallaci, a prominent journalist, published last year an inane and foul-mouthed diatribe titled "The Rage and the Pride" in which she accused Muslims of "breeding like rats", "shitting and pissing" (sic!) everywhere and supporting Osama bin-Laden indiscriminately. Young Muslims reacted - by further radicalizing and by refusing to assimilate - to both escalating anti-Islamic rhetoric in Europe and the "triumphs" of Islam elsewhere, such as the revolution in Iran in 1979. Tutored by preachers trained in the most militant Islamist climates in Saudi Arabia, Yemen, Somalia, Pakistan and Iran, praying in mosques financed by shady Islamic charities - these youngsters are amenable to recruiters from every fanatical grouping.