I haven’t read this book, although the French, alas, had some of the worst colonies in the world (well, actually, the Belgians were worse) and have always had a racial problem. They were very much into phrenology and all sorts of fake sciences in the 19th century to demonstrate that the French were the masters of the universe.
However, what the French don’t acknowledge is that by abandoning Christianity, they have abandoned the root of Europe and they’re on their own now and have no defense against the hordes (from where ever, but mostly now I would say from Islamic lands).
Read The Mosque of Notre Dame.
Who wrote it?