When I went to buy a cellphone in the Middle East, I was asked the typical questions: name, nationality, address. But then as the clerk was filling out the form, he asked, “What’s your father’s name?” That question surprised me, and I wondered why it was important. Knowing my father’s name would not be important in my culture, but here it was necessary in order to establish my identity. In some cultures, ancestry is important.

The Israelites believed in the importance of ancestry too. They were proud of their patriarch Abraham, and they thought being part of Abraham’s clan made them…