Using public data on first names, one can figure out how fast the population replacement is happening in France despite the ban on informative statistics. Selected results. 
As elsewhere, the foreign born are clustered in cities.
Foreign born is a decent proxy for where the Muslims and Africans are having children.
And the clever proxy of using sickle cell anemia also works well, but has low resolution.
Overall summary stats of differences
Commune-level median income vs. foreign born%, only in the Paris region (to avoid spatial confounding)
Higher education shows a weird anomalous pattern though
Implied effects on crime rates, using department level data only. Most are sensible, but a few are pretty strange (in the bottom), may reflect criminals doing crime in other departments than where they live.
Models suggest the Muslims and Africans have a mean IQ around 80. This is about the value expected by national IQs.
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