Was Greece the birthplace of humanity?

[Mav]

We need to agree on a definition of "race" before we can start talking about "racism.

All we need is the dictionary definition.  This is from the online OED:

Each of the major divisions of humankind, having distinct physical characteristics.
‘people of all races, colours, and creeds’
More example sentencesSynonyms
1.1mass noun The fact or condition of belonging to a racial division or group; the qualities or characteristics associated with this.
Example sentences
1.2 A group of people sharing the same culture, history, language, etc.; an ethnic group.
‘we Scots were a bloodthirsty race then’
More example sentencesSynonyms
1.3 A group or set of people or things with a common feature or features.
‘the upper classes thought of themselves as a race apart’
More example sentencesSynonyms
1.4Biology A population within a species that is distinct in some way, especially a subspecies.
‘people have killed so many tigers that two races are probably extinct’
More example sentences
1.5 (in non-technical use) each of the major divisions of living creatures.
‘a member of the human race’
‘the race of birds’
More example sentences
1.6literary A group of people descended from a common ancestor.
‘a prince of the race of Solomon’
More example sentencesSynonyms
1.7archaic mass noun Ancestry.
‘two coursers of ethereal race’

In other words, both Greeks and Muslims can be described as races for the purposes of defining racism.  It isn't limited to Caucasians or Asians, for example.

In fact, in modern times, the idea of humans being divided into genetically discrete races is seen increasingly as an unfortunate mistake which has in fact led to racism.  As the ads for Ancestry.com demonstrate, our DNA is usually a mix of influences.  I remember seeing US a talk show that had a white supremacist on it and he agreed to a DNA test.  He had no fear because he was as white as white can be.  Yet the test showed he had a considerable African heritage and he was devastated.  Subsequently, he was shunned by other white supremacists