This forms a large group of related, largely monotheistic religions, generally held to include Judaism, Christianity, Islam, and the Bahá’í Faith (based upon Islam), and comprises about half of the world's religious adherents.
According to the Jewish tradition, Abraham was the first person to reject idolatry, hence he symbolically appears as the founder of monotheistic religions. In that sense, Abrahamic religion could be simply equated with monotheistic religion, but not all monotheistic religions are Abrahamic. In Islam he is considered as the first monotheist and is often refered to as Ibrahim al-Hanif or Abraham the Monotheist. The term, desert monotheism, is sometimes used for a similar purpose of comparison in historical contexts, but not for modern faiths.
All the Abrahamic religions are derived to some extent from Judaism as practiced in ancient kingdoms of Israel and Judah prior to the Babylonian Exile, at the beginning of the 1st millennium BCE. Many believe that Judaism in Biblical Israel was renovated and reformed to some extent in the 6th century BCE by Ezra and other priests returning to Israel from the exile. Samaritanism separated from Judaism in the next few centuries.
Christianity originated in Judea, at the end of the 1st century, as a radically reformed branch of Judaism; it spread to ancient Greece and Rome, and from there to most of Europe, Asia, the Americas, and many other parts of the world. Over the centuries, Christianity split into many separate churches and denominations. A major split in the 5th century separated various Oriental Churches from the Catholic church centered in Rome. Other major splits were the East-West Schism in the 11th century, separating the Roman Catholic Church from the Eastern Orthodox Churches; and the Protestant Reformation of the 16th century, that gave birth to hundreds of independent Protestant denominations.
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