Who Is A Jew?
Judaism shares some of the characteristics of a nation, an ethnicity, a religion, and a culture, making the definition of who is a Jew vary slightly depending on whether a religious or national approach to identity is used. Generally, in modern secular usage, Jews include three groups: people who were born to a Jewish family regardless of whether or not they follow the religion; those who have some Jewish ancestral background or lineage (sometimes including those who do not have strictly matrilineal descent); and people without any Jewish ancestral background or lineage who have formally converted to Judaism and therefore are followers of the religion.
Historical definitions of Jewish identity have traditionally been based on halakhic definitions of matrilineal descent, and halakhic conversions. Historical definitions of who is a Jew date back to the codification of the Oral Torah into the Babylonian Talmud, around 200 CE. Interpretations of sections of the Tanakh, such as Deuteronomy 7:1–5, by learned Jewish sages, are used as a warning against intermarriage between Jews and Canaanites because " will cause your child to turn away from Me and they will worship the gods (i.e., idols) of others." Leviticus 24:10 says that the son in a marriage between a Hebrew woman and an Egyptian man is "of the community of Israel." This is complemented by Ezra 10:2–3, where Israelites returning from Babylon vow to put aside their gentile wives and their children. Since the Haskalah, these halakhic interpretations of Jewish identity have been challenged.
At times, conversion has accounted for a substantial part of Jewish population growth. In the first century of the Christian era, for example, the population more than doubled, from four to 8–10 million within the confines of the Roman Empire, in good part as a result of a wave of conversion.
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