And what makes you think they will remain religious in France?
You dont think there isnt assimilation in France?
In general Sephardic “non religious” keep more than Ashkenzaic “non relgious” and tend to respect their gedolim even if they are not relgious themselves, which is not the case with Ashkenanzim. So they will not be as non-relgious as is made out to be in this article. It is easier to be a jew even if Non-relgious in israel than in France. And it is more likley they will be lost in France than in israel. Its much harder to intermarry in Israel than it is in France