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Judaism, Christianity and Islam are the world's three major monotheistic religions, and fittingly, they all share many similar characteristics. But they have many key differences as well. Judaism is the oldest of the three, with its beginnings coming about 6,000 years ago.

The other two came from Judaism later on. The holy book of the Jewish people is the Torah, which contains the Five Books of Moses (also known as the Old Testament), the prophet whom Jews consider to be the greatest of all. The largest Jewish population in the world is located in Israel, with large concentrations across the United States, especially in New York.

Christianity came about approximately 2,000 years ago, and holds to the belief that Jesus was the son of God and the Messiah and will come to Earth again someday. The main sects of Christianity are Catholicism and Protestantism, which both have many sects within themselves. The Christian Bible contains both the Old Testament and the New Testament.

Islam was founded by the prophet Mohammed about 600 years after the birth of Christianity. The highest concentration of Muslims is in the Middle East and in Southwest Asia. The holy book of Islam is the Koran, which contains many of the same writings as the Torah and the Christian Bible.