The basic beliefs of Christianity are all based on the Holy Bible. Some branches have changed things or added to the Bible, but orthodox Christianity holds the Bible as the only basis and the only truth in Christianity.
orthodox Christianity
It was Orthodox Christianity.
Orthodox Christianity.
The Greek Orthodox regard themselves as the Original Christianity.
Islam and Catholic/Orthodox Christianity.
Orthodox Christianity
Orthodox Christianity.
Greek Orthodox is a denomination in Christianity.
Eastern Orthodox is a branch of Christianity.
Christianity
Russian Orthodox,or Orthodox Christianity,both mean the same thing :)