In modern times, various Jewish groups have argued whether Jewishness is a function of ethnicity (membership in a descent group, a function of birth), nationality (citizenship in a state, a function of politics), religion (membership in a group characterized by various beliefs and practices), or all three. These fundamental conceptions were already in place in antiquity; the peculiar combination of ethnicity, nationality, and religion that would characterize Jewishness through the centuries first took shape in the second century B.C.E. This book studies the ways in which these elements were understood and applied in the construction of Jewish identity - by Jews, by gentiles and by the state - in such a way that the question "Who was a Jew?" could be variously answered.

Why aren't Jewish women circumcised? This improbable question, first advanced by anti-Jewish Christian polemicists, is the point of departure for this wide-ranging exploration of gender and Jewishness in Jewish thought. With a lively command of a wide range of Jewish sources—from the Bible and the Talmud to the legal and philosophical writings of the Middle Ages to Enlightenment thinkers and modern scholars—Shaye J. D. Cohen considers the varied responses to this provocative question and in the process provides the fullest cultural history of Jewish circumcision available.