Islam is not Abrahamic. They just made up a connection to him. The other two are from his direct descendants.
Abrahamic religions 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).[3] The major Abrahamic religions in chronological order of founding are Judaism (the base of the other two religions) in the 7th century BCE,[4] Christianity in the 1st century CE, and Islam in the 7th century CE.