Eurabia in Belgium....

The soft jihad is very scary....

A clash of civilizations may be taking place on the battlefields of Iraq and Afghanistan, but it's also happening a lot more quietly in European cities.

Old Europe's population is dwindling even as immigration and high birth rates among Muslim groups are swelling in cities all over the continent.

And in Belgium, it is no different.

Filip Dewinter, a leader of the far-right separatist party Vlaams Belang, predicts there will eventually be a kind of civil war when the longtime residents of Brussels — the nation's capital and administrative seat of the European Union — realize their city is about to be taken over by Muslim immigrants.

Although there are no official statistics on how many Muslims live in Brussels, it is believed they make up about 25 percent of the city’s 1 million urban residents. Dewinter, who opposes immigration and has called Islamophobia a "duty," claims three of the 19 sections of Brussels, each with its own mayor, now have Muslim majorities.

"In those neighborhoods it's not our government that's in power," he said, "but the Muslim authorities — the mosques, the imams — who are in charge."

FOX News visited one of those neighborhoods, called Molenbeek, which looks more like North Africa than the heart of Europe.

For some Belgians, that's not a problem. The mayor of Molenbeek, Socialist Philippe Moureaux, has worked hard to help Muslims try to integrate over the past decade and a half.

Moureaux believes multiculturalism is a good thing. He says even those who disagree with him should get used to life as it is in Brussels today: "Be realistic. They're here. They're relatively numerous and they're growing."