Michael, I don't see how you can pull out some biological facts about the common ancestry of mankind to justify your sense of alienation from the Jewish heritage. Torah and science both tell exactly the same story in this case - that we all descended from the first human beings. So I don't think this is a valid argument against staying in touch with your family, people and heritage.

Besides I wonder why some people seem to think that caring about ones family makes you less sensitive towards the needs of other people. On the contrary, I think that the family is (or should be) the place where a person first learns about love and caring for others.