The oldest Christian communities in the world are in Egypt, Turkey, Palestine (where Bethlehem is), Iraq, Syria, Lebanon, etc. The only country where a Church is illegal is Saudi Arabia (the UAE has several, Bahrain has a couple, not sure about Kuwait and Qatar). Building a mosque is illegal in the Vatican.

There is no ancient Muslim community in a Christian ruled country in Europe. The ones in Spain, Portugal and Italy were completely wiped out by genocide, conversion or expulsion. Remember, Spain had a huge population of Muslims till 500 years ago.

As for moving people from Europe to Asia and Africa, it happened for 500 years. It was called colonialism. Asians and Africans could not go to European neighbourhoods, schools, streets, etc. In South Africa, this existed till 1994 under Apartheid. I am assuming that you were alive then?

Is it so easy for you to talk about stuff you don't know anything about?