Like I said, that is how I see things. It is my opinion that if a person isn't in contact with something, then they aren't really a part of it. I have German, Sweedish, English, and Jewish blood from my grandparents, and I consider myself American, because that is who I am.
I can see your view point though for ethnicities more than religion though. As far as Jews, if they practive the faith, then they are Jewish, IMO. Maybe I don't have the politically correct or the prevailing opinion, but that is how I see things. Like I said that has a biblical basis for Christians, and that is why I believe it.