If an Icelandic couple moves to Africa, learns a Bantu language, and has a child who then also learns the language, is the child then a Bantu?
You can be non-Caucasian and still be German.
A country is the spirit and character of a people. That's what makes a country what it is. Not political boundaries on a map. And groups of people don't just take on a new spirit and character if they move into new political boundaries en masse.
The spirit and character of a people comes from their DNA. And their DNA comes from their environment over many thousands of years.
If the majority of the population in Germany were to be African or Arab, do you really think Germany would retain it's particular character that makes it European and German? No of course not! You would have to be insane to think that it would.
Were that to come to pass, Germany would look a lot more like countries in Africa or the Middle East than a European country.
With the recent migrant madness we are already seeing troubling signs of this, with loads of horrendous crimes hitherto unknown in Europe.
It's not just the excess of crime that doesn't bode well, but that these foreign populations, even into 2nd 3rd generation receive welfare at much higher rates than the general population.
Why would it ever be a good idea to take in loads of immigrants who are a net drain on the economy in multiple ways? Europe can't babysit the world in this way. Not only does make it make no sense, but it is unsustainable, the time at which our welfare states have become totally dismantled from this looting is rapidly approaching.
Many resources are finite. Why should grandparents who spent a life time contributing to the system have their benefits cut, so politicians can try to import future voters in order to extend their reign? It's madness. It is destroying the western world.
So, that's a long-winded way of saying, no a "non-caucasian" or anything else but an ethnic European, ethnic German cannot be a "german." Maybe someone else is a citizen of the Bundesrepublik. But that is just a piece of paper symbolizing an abstract system of agreements. The biological reality of what makes the German people what they are and by extent what Germany is, is another thing entirely.
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I'm sure all of the Germans of Turkish familial origin
Funny you picked the Turks, who are notoriously unintegrated in Germany. Just like all the muslims across Europe of course, but some of the Turks have been here since the 1970s. So it makes people take notice and say, "uh oh!" In fact, this was more or less the reason for Angela Merkel's dictum years back saying "Multiculturalism has failed."