The term Orthodox means “straight teaching” or “straight worship,”
It is a term derived from two Greek words: orthos, “straight,” and doxa, “teaching” or “worship.”
Throughout the history of the church, false teaching and division have threatened the purity of the church. Division, in particular, over minor and secondary issues has obscured the identity and purity of the Church universal as various groups have partitioned off into distinct denominations.
So, the concept of orthodoxy came to be applied to those essential core ideas and doctrines that must be confessed in order to be rightly called Christian. Looking beyond any particular local church’s or denomination’s outward practices, it is adherence to the seven points of orthodoxy that defines a church as “straight” in its teaching, and so thusly can rightly be called, "Christian."