Abrahamic religion spread globally through Christianity being adopted by the Roman Empire in the 4th century and Islam by the Islamic Empires from the 7th century. Today the Abrahamic religions are one of the major divisions in comparative religion (along with Indian, Iranian, and East Asian religions). The major Abrahamic religions in chronological order of founding are Judaism in the 7th century BCE, Christianity in the 1st century CE, and Islam in the 7th century CE.
Christianity, Islam, and Judaism are the Abrahamic religions with the greatest numbers of adherents. Abrahamic religions with fewer adherents include the faiths descended from Yazdânism (the Yezidi, Yarsani and Alevi faiths), Samaritanism, the Druze faith (often classified as a branch of Isma'ili Shia Islam), Bábism, the Bahá'í Faith and Rastafari.
As of 2005, estimates classified 54% (3.6 billion people) of the world's population as adherents of an Abrahamic religion, about 32% as adherents of other religions, and 16% as adherents of no organized religion. Christianity claims 33% of the world's population, Islam has 21%, Judaism has 0.2% and the Bahá'í Faith represents around 0.1%.
It was suggested by Louis Massignon that the phrase "Abrahamic religion" means that all these religions come from one spiritual source. Paul the Apostle referred to Abraham as the "father of us all". There is a Quranic term, millat Ibrahim, 'religion of Ibrahim', indicating that Islam sees itself as standing in a tradition of religious practice from Abraham. Jewish tradition claims that the Jews are descended from Abraham, and adherents of Judaism derive their spiritual identity from Abraham as the first of the three "fathers" or biblical Patriarchs: Abraham, Isaac, and Jacob.
All the major Abrahamic religions claim a direct lineage to Abraham, although in Christianity this is understood in spiritual terms: