https://www.city-journal.org/anti-semitism-paris-new-york
Anti-Semitism seems to be as ancient as the Jewish people themselves. Hellenistic texts from 300 BC exude stereotypes regarding Jews’ physical traits and supposed love for money. Anti-Semitism, however, comes in many shades, depending on the local culture, just as being Jewish in the diaspora is a varied experience. Living in Paris and New York, I see this difference explicitly. When I first rented a place in Manhattan, I was flabbergasted by the mezuzahs attached at so many entrances, including of commercial establishments. Despite the recent outbreak of anti-Semitic attacks in New York, Jews are not a tiny minority in the city and have no reason to hide. In Paris, we tend to be more discreet; if we have a mezuzah, we will usually place it inside.
In New York, Jews are divided into distinct communities—Conservative, Modern Orthodox, Reform, ultra-Orthodox—not familiar in France. In Paris, where Jews are scattered around the city, the main distinction is between Ashkenazim—Jews with an Eastern European background—and Jews who came to France in the 1960s from Algeria and other North African colonies, following independence. This second group now constitutes a majority and doesn’t always see eye-to-eye politically and culturally with the Ashkenazim, especially on the question of Israel. French society, however, which promotes active laicization as a positive value much more vigorously than does America, has largely secularized all of us. The French generally do not attend religious services, except for weddings and funerals: on Sunday morning, churches stay mostly empty, and the same goes with most synagogues on Saturday. Paris’s Orthodox Jewish community is rather small and concentrated in specific neighborhoods of Paris and its suburbs.