In the Dutch province of Friesland, 250 of 720 existing churches have been transformed or closed. The Fatih Camii Mosque in Amsterdam once was the Saint Ignatius Church. A synagogue in The Hague was turned into the Al Aqsa Mosque. In Flanders, in place of a famous church, a luxury hotel now stands. Catholic arches, columns and windows still soar between menus and tables for customers.

“The French will not wake up until Notre Dame becomes a mosque.” — Emile Cioran, author.

— Emile Cioran, author. Germany is literally selling its churches. Between 1990 and 2010, the German Evangelical Church closed 340 churches. Recently in Hamburg, a Lutheran church was purchased by the Muslim community.

“History teaches us that these transformations are rarely innocent.” — Bertrand Dutheil de La Rochère, assistant to Marine Le Pen.

Last year, at the famous Biennale artistic festival in Venice, Swiss artist Christian Büchel took the ancient Catholic Church of Santa Maria della Misericordia and converted it into a mosque. The church had not been used for Christian worship for more than forty years. Büchel decorated the baroque walls with Arabic writing, covered the floor with a prayer rug, and hid the crucifix behind a prayer niche indicating the direction of Mecca, the holy city of Islam. It was a provocation.

But everywhere else in Europe, the practice of Islam really is outstripping Christianity, while Jews are leaving — not only France but the old continent — en masse.

In January, Zvi Ammar, the president of the Marseille Israelite Consistory, recommended that Jews that stop wearing a kippah (skullcap) when out in the street. Too many anti-Semitic incidents have cast fear into the hearts of Marseille’s 70,000 Jews, who make up a tenth of the city’s population. 500 Jews already left the city in 2015. A few days ago, Mr. Ammar announced another attempt at appeasement: the conversion of a historic synagogue into a mosque.

The synagogue Or Torah [“light of the Torah”] was bought by the Muslim organization Al Badr for 400,000 euros ($456,000). The synagogue was empty, due to rampant anti-Semitism in Marseille, while the nearby mosque, run by Al Badr, was unable to handle the overcrowding every Friday, with the faithful forced to pray in the street (a quarter of the inhabitants of Marseille are Muslim). Muslims in Marseille already have 73 mosques.

A year ago, the Muslim French leader Dalil Boubakeur suggested turning empty churches into mosques. It is the first time in France that something similar happened to a synagogue. “History teaches us that these transformations are rarely innocent,” said Bertrand Dutheil de La Rochère, an assistant to Marine Le Pen, leader of the National Front party. He appeared to be comparing the fate of the synagogue to that of the Hagia Sophia Basilica, which became a mosque in Constantinople (now Istanbul) in 1453, after its capture by the Muslim Ottoman Turks.

“What should we do?” Zvi Ammar asked this author.

“Security concerns had already pushed the Jews out of the city’s center. We could no longer live in a Muslim area, so the synagogue was empty. Thousands of synagogues in the Arab-Islamic world, from Libya to Morocco, from Iraq to Tunisia, have been converted into mosques. The only difference is that in France, Muslims cannot expropriate a synagogue; they have to pay for it.”

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A few years ago, Niall Ferguson, the brilliant contemporary historian, wrote about Europe’s future as “the creeping Islamicization of a decadent Christendom.” It is easy to find images of the decay of Europe’s Christianity and the growth of Islam in the heart of the old continent. Every traveler in any modern European city can notice the new mosques being built alongside abandoned and secularized churches, some converted into museums.

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In the Dutch province of Friesland, 250 of 720 existing churches have been transformed or closed. The Fatih Camii Mosque in Amsterdam once was the Saint Ignatius Church. A synagogue in The Hague was turned into the Al Aqsa Mosque. The Church of St. Jacobus, one of the oldest of the city of Utrecht, was recently converted into a luxury residence. A library just opened in a former Dominican church in Maastricht.

The main mosque in Dublin is a former Presbyterian church. In England, the St. Marks Cathedral is now called the New Peckam Mosque, while in Manchester, the Mosque of Disbury was once a Methodist church. In Clitheroe, Lancashire, the authorities granted permission to have an Anglican church, Saint Peter’s Church in Cobridge, transformed into the Madina Mosque. It is no longer taboo in the media to talk about “the end of British Christianity.”

Belgium, once a cradle of European Catholicism, is closing dozens of its churches. The Church of St. Catherine, built in 1874, dominates the historic center of Brussels, the only religious building created in the city’s “pentagon” at the end of Ancien Régime, and today one of the most protected in the EU’s capital, especially after the terror attacks there on March 22, 2016. Brussels, however, wanted to convert the church into a fruit market. Only the mobilization of the faithful hindered the city’s plan.

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Despite the fact that the “Pope Emeritus,” Joseph Ratzinger, comes from Germany, that Chancellor Angela Merkel is the daughter of a Lutheran minister and the current German president, Joachim Gauck, is a Protestant pastor, Germany is literally selling its churches. Between 1990 and 2010, the German Evangelical Church closed 340 churches. Recently, in Hamburg, a Lutheran church was purchased by the Muslim community. In Spandau, the church of St. Raphael is now a grocery store. In Karl Marx’s town, Trier, some churches have been turned into gyms. In Cologne, a church is now a luxurious residence with a private pool.

The writer Emile Cioran once cast a sinister prophecy on Europe: “The French will not wake up until Notre Dame becomes a mosque.” Five years ago, a French historian, Dominique Venner, shot himself on the altar of Notre Dame, Paris’s most famous Cathedral. This suicide, which the mainstream media dismissed as the gesture of a Catholic crank, was a terrible warning to Europe. But no one was paying attention.