Overpopulation is not about the food, it's about the quality of life.

There are 7.000.000.000 people and 300.000 wolves, 75.000 leopards and 7.000 cheetas. Should there be 70b people and 7 cheetas?

It's also about the simple things, like traffic jams. But we will build new roads, and make further partition of habitats. So... I don't care it Europe can sustain 5x more people if we screw everything else.

There are many reasons for these trends. Against popular beliefs, the dominant religion of a country or its respective people is among the least crucial factors which are contributing to their fertility and therefore their growth rate.

How wide is the lens? lf you are comparing poor countries vs rich countries you are right. But take some data about Kosovo, the is a clear statistics for every decade. BTW, France has no such stats.

Assimilation... Are they ever going to eat pork? Why do you think they would change other customs. What is the most common baby name in FRA, DEN, NED? Have the Gypsies assimilated after 1000 years in Europe? Did they get equally educated? Fertility rates?

Now, why you think this class will integrate?

Some authors are even arguing that education is the most important factor for demographic change of all

Probably... But who claims that edu. will be equal between those ethnicities?

And the available data seem to support this idea, since in countries where women had initially an education of about zero years, which later changed to something around six years, the fertility rates declined by about 40%. What a bliss.

Again, the extreme. What is happening once we have almost 100% with a highschool+ ?