Ancestry.com, the site where you trace your family lineage, advertises with a guy who thought he was German but did a DNA test & found out he was Irish & Scottish. Color me skeptical that a DNA test can tell a German from a Celt–especially since the Celts derive from somewhere in the Rhineland. What would the DNA show in someone like me who is both Irish & German?
The same thing is true all over the planet. How do you tell an Indian from a Pakistani? Or a Mexican from a Guatemalan? Or a Palestinian from a Jordanian? Or a Ugandan from a Nigerian?