This article is about adherence to accepted belief, especially in Christianity. For the book by G. K. Chesterton, see Orthodoxy (book). For the Churches most often called "Orthodox", see Eastern Orthodox Church and Oriental Orthodoxy. For other uses, see Orthodox. Adherence to the Nicene Creed is a common test of orthodoxy in Christianity. Orthodoxy (from Greek ὀρθοδοξία orthodoxía "right opinion") [1] is adherence to correct or accepted creeds, especially in religion. [2] In the Christian sense the term means "conforming to the Christian faith as represented in the creeds of the early Church." [3] The first seven ecumenical councils were held between the years of 325 and 787 with the aim of formalizing accepted doctrines. In some English speaking countries, Jews who adhere to all the traditions and commandments as legislated in the Talmud are often called Orthodox Jews, although the term "orthodox" historically first described Chr...