The US population grows every day, largely due to immigration and births to immigrants. Very few are Muslims.
There really are too many people on the planet for any sustainable future. Russia is not one of the world's more pleasant places to live. The climate is too frigid, the distances too great, the salaries too low.
Communism was bad, but for many Russians, it was a whole lot better than what they have now.
It is quite unlikely that there will be no Russians in three generations. It is even less likely that the French and Italians will disappear.
It is unlikely that anything could vindicate Richpo, either. But that is a whole nother issue.
The Church has almost nothing to do with sex ed in France or Italy, because only a very few actually go to church anymore, fewer pay attention, and fewer still follow what the Church tells them about birth control.