Also, as to a revival of Christainity, you're far more defeatist than I imagined. People throughout the eons and today have decided in favor of Catholic values, including the belief that sex belongs only in marriage between a man and a woman. The fact you cannot imagine French men and women capable of this view is astonishing. So, the basic identity of French people is that any sex any where any time. No different than the Playboy philosophy? I know I've met people in France who are not like that. They, in fact, believe in Catholic dogma.
Yes, there is a Catholic remnant in France.
But even in the heyday of the Church there, France had a singularly bad reputation. His Most Christian Majesty usually had a half dozen children out of wedlock, at least. Louis XIV probably had hundreds.
When there is no official statistic (and there isn't) the plural of anecdote is data. One sees it all over France. Of course, the data will NEVER exist, because France isn't going to make official racial distinctions among Frenchmen. Still, there have been private samplings, published in the various media, and the trends are good. I will see if I can find some and post them to you.