I think OP's point is that it's arbitrary and context dependent where the line between races is drawn. It also includes non-genetic cultural traits, as in your example.

Should a different eye color detemine a race demarcation? Is e.g. religion a factor in detemining a race?

The examples you listed are probably better described as ethnic groups, which are not genetically detemined, not necessarily mutually exclusive and quite vaguely defined.