This appears to be heavily downvoted but hard to argue against seeing how irreligious the second generation has been since the big influx of North African immigration started. Religion has not been very successful in France for a while now
No, of course not. Second-generation immigrants and later trend towards the culture of their host country. Third generation is indistinguishable from the rest of the population. This is universally seen...except for Jews, who have long memories of systematic oppression.