should Europe worry from the refugees?

Britain and the rest of the European Union are ignoring a demographic time bomb: a recent rush into the EU by migrants, including millions of Muslims, will change the continent beyond recognition over the next two decades, and almost no policy-makers are talking about it.
The numbers are startling. Only 3.2 per cent of Spain's population was foreign-born in 1998. In 2007 it was 13.4 per cent. Europe's Muslim population has more than doubled in the past 30 years and will have doubled again by 2015. In Brussels, the top seven baby boys' names recently were Mohamed, Adam, Rayan, Ayoub, Mehdi, Amine and Hamza.
Europe's low white birth rate, coupled with faster multiplying migrants, will change fundamentally what we take to mean by European culture and society. The altered population mix has far-reaching implications for education, housing, welfare, labour, the arts and everything in between. It could have a critical impact on foreign policy: a study was submitted to the US Air Force on how America's relationship with Europe might evolve. Yet EU officials admit that these issues are not receiving the attention they deserve.
Jerome Vignon, the director for employment and social affairs at the European Commission, said that the focus of those running the EU had been on asylum seekers and the control of migration rather than the integration of those already in the bloc. "It has certainly been underestimated - there is a general rhetoric that social integration of migrants should be given as much importance as monitoring the inflow of migrants." But, he said, the rhetoric had rarely led to policy.
The countries of the EU have long histories of welcoming migrants, but in recent years two significant trends have emerged. Migrants have come increasingly from outside developed economies, and they have come in accelerating numbers..

Source: https://www.telegraph.co.uk/news/worldnews/europe/5994047/Muslim-Europe-the-demographic-time-bomb-transforming-our-continent.html