Isaric Christianity is a highly syncretic form of Christianity that emerged early in 2008 as a distinct kind of Hebraic evangelicalism, though its foundation was laid several decades earlier in a mixed Hebrew and Gentile Christian setting. It combines various elements from Syriac Orthodox Christianity, Evangelical Protestantism, Schwertler Anabaptism, Messianic Judaism, Karaite Judaism, Samaritanism, and even Germano-Celtic Christian mysticism. Although Isaric Christianity and Messianic Judaism share many similarities, the two sects are not related. Isars consider themselves to be "Keepers," i.e., the modern representatives of ancient Samaritan Christianity, and claim descent from the tribe of Manasseh (Menasheh).
An adherent of Isaric Christianity is called an "Isar", which is an English term for the original Aramaic, "Isaraya", meaning "one who is of or characterized by a bond." Isars consider themselves to be neither Jewish nor Gentile (non-Hebrew), but a unique kind of "other" category, much like Samaritans. Isaric worship bears a stronger resemblance to Jewish and Muslim worship practices than it does to other forms of Christian worship. For example, Isars keep four prayer 'offices' daily, two of which involve different prayer postures like prostration, bowing, and kneeling. Additionally, Isars observe a seventh day 'shabbat' (sabbath), and celebrate the traditional Hebrew festivals outlined in Leviticus 23. However, the manner in which they keep these holy days differs substantially from Jewish observance. The Isaric liturgy is mainly in Isaric Aramaic, although certain components are in English. Most Isars attend other Christian churches on Sundays in order to remain a part of the broader Christian community, although they do not become official members or personnel thereof.
Much of the inner workings and beliefs of the Isaric Church (also known as the Isaric Christian Brotherhood) are kept private. This has to do with the rank-style of polity and structure of the church, which resembles the structure of the Salvation Army and various military organizations.