Greek Orthodox Church
306. Doss the Catholic Church recognise the Greek Orthodox Church as part of itself?No. As a matter of fact there is no one Greek Orthodox Church. There are many independent Greek Churches. They originated by rebellion against the Catholic Church in the ninth century, and have split up into many different allegiances. As long as they refuse to submit to the authority of the Catholic Church they are as much outside the Catholic Church as the Protestant variations.
307. How does the Greek Church differ from the Catholic Church?
The Greek Churches are both schismatical and heretical. They are separated from the obedience due to the authority of Christ in His true Church. They acknowledge no infallible head. They may retain valid orders and the Mass—things which Protestantism lost—but they have fallen into errors concerning the Holy Trinity, the Immaculate Conception, Purgatory, and various other points of Christian doctrine.