This wasn't always the case in France. Some of the greatest saints in the Catholic Church emerged from this country.
I used to work for Air France in their North American HQ and traveled frequently to France on business. I got to know the French. Like their european neighbors, the French have slipped into the same religious decay. This was well expressed by (former Cardinal) Ratzinger in his Pro Eligendo homily, delivered to the Cardinals assembled at the Conclave to elect the next pope.
"How many winds of doctrine have we known in recent decades, how many ideological currents, how many ways of thinking. The small boat of the thought of many Christians has often been tossed about by these waves - flung from one extreme to another: from Marxism to liberalism, even to libertinism; from collectivism to radical individualism; from atheism to a vague religious mysticism; from agnosticism to syncretism and so forth. Every day new sects spring up, and what St Paul says about human deception and the trickery that strives to entice people into error (cf. Eph 4: 14) comes true. "
In their efforts to educate their children, they have limited the number of births and turned over 'menial jobs' to Muslim immigrants. Throughout Europe, the natives are shrinking in numbers while their Muslim immigrants are reproducing like rabbits. Run the numbers; it's only a matter of time before we see the total demise of western Europe and its culture.
Run the numbers; the same will happen here in the US.