Often Eastern Orthodox churches are confused with Roman Catholicism. Eastern Orthodoxy, like Protestantism, does have some roots in Catholicism, but also like Protestantism, it has a unique history and theology. Like Protestants and Catholics, there are different doctrines which are viewed as fatal heresies by many.
There are common beliefs held by Catholicism, Reformation Protestantism, and Eastern Orthodoxy. They include belief in the divine inspiration of the Old and New Testaments, the two natures of Christ, the Trinity, the historical crucifixion and bodily resurrection of Christ, a belief in the early creeds (AD 325-451). For example, all would agree that a rejection of the Trinity constitutes fatal heresy. But there are several significant doctrines which ultimately separate us from each other. And there are some doctrines jointly held by Eastern Orthodox churches and the Roman Catholic Church that Protestants reject as unscriptural. These controversial and disputed doctrines will be addressed in this journal.