Given from the Catholic Broadcasting Station 2SM Sydney Australia
Choose a topic from Vol 1:
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.
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.