Following is text from the YouTube page:
According to a report of the French senate, 2800 churches across the country, many of them centuries old, will be demolished as restoration costs exceed the cost of demolitions over the next years. This church, Église Saint-Jacques d’Abbeville, a Neo-Gothic masterpiece in Abbeville, Nord-Pas-de-Calais-Picardie dating back to 1868, was demolished for a total cost of 350,000€ in 2013. The reasoning: It was much cheaper to demolish it than it would cost to restore.
As the number of Frenchmen in France continues to decline due to record-low birth rates, high emigration and Muslim immigration, so do the members of Catholic faith, who are now at an all time low. For many cities in France, especially cities in which Christians are the minority, the lack of interest and high property value on which the buildings stand simply does not justify the cost of restoring the churches. Many mayors choose the cheaper demolitions over costly restorations. Thousands of churches are to be demolished over the next years and replaced with shopping malls, stores, apartments or parking lots.
Mosques, on the other hand, flourish. The Grand Mosque of Paris recently got a modern, fully retractable roof, as it is usually only found in football stadiums and hundreds of new Mosques are built every year for the hundreds of thousands of new Muslims born or immigrating into French society, often with taxpayer money.
German source: http://www.katholisches.info/2013/09/01/umbau-der-kulturlandschaft-2800-kirchen-sollen-in-frankreich-verschwinden/