What does your heritage mean when you don't know where you come from? I've been thinking about this lately from several perspectives:
1) What if Barack Obama had been adopted and no one knew anything about his father? How would that effect perceptions? Would there still be people saying he isn't "black enough", or "isn't really black", because of the quantity if melanin in his skin? I doubt it.
2) My wife - who was adopted - discovered her own Jewish heritage only in her twenties, when she found out about her birth father. Now she is trying to find the place for that heritage in her own life (she was raised California Protestant but is now Bay Area Agnostic). She finds that her most important values (education, community, family) are also strong values of the Jewish tradition. These values are certainly not exclusive to her or to Jewishness - does it matter which labels you put on these values?
3) I was somehow sure that my grandparents on my mother's side were from Bohemia or Austria - and I discovered only as a grown man that they were in fact from Poland. What is my Polish heritage, and what happens to the Bohemian heritage I thought I had? I know nothing, really, about Polish culture, but then again I knew almost nothing about Czech or Austrian culture either. I feel no heritage at all in relation to these nation-states or ethnicities. My other half is German Jewish and I feel the same way about that. What I do feel is that I am a 21st Century Northern Californian American.
4) My father is a self-proclaimed "fanatical atheist", but in his life's work, as a compassionate therapist, author and social worker, his values are very close to the 'Theology of Liberation' developed by radical priests in Latin America. He is - in his teachings - remarkably close to the Jesus they worship in theirs. It is the values that matter, not the names that go on them. The Jesus of loving, of giving, of sharing, of affirming and welcoming all, is a good enough Jesus for any fanatical atheist to accept a human being worth honoring. (The gay-bashing, woman-hating, damnation-threatening, nasty Jesus according to St. Paul, on the other hand, is basically a jerk).
I am not a big fan of the concepts of nations and races and ethnicities and tribes. On the one hand, people like to celebrate their commonalities, their traditions, their music and clothing and food, but on the other hand - we all know the ugly side of that stuff. Will it ever be possible to have the one without the other? 21st Century Northern Californian America is as close as I will probably ever see it. Which is why I am proud of that heritage.