An Abrahamic religion is a religion whose people believe that the Hebrew patriarch Abraham and his descendants hold an important role in human spiritual development. The best known Abrahamic religions are Judaism, Christianity and Islam. Smaller religious traditions occasionally listed among the larger Abrahamic religions include: Samaritanism, Druze, Rastafari, Yazidi, Babism, Bahá'í Faith, and Mandaeism (not really an Abrahamic religion, they believe that Abraham was a false prophet).
Abrahamic religions are "monotheistic", meaning that they believe in just one God. They also all believe that people should pray to and worship this God often. The Abrahamic religions are the world's most common monotheistic religions.