How is the Eastern Orthodox Church different from the Roman Catholic Church?

Answer 1

Catholicism is under the authority of the Pope, while Orthodoxy is under the authority of its various Patriarchs.

Roman Catholic AnswerThe Catholic Church is the living, breathing, Church founded by Our Blessed Lord before He left this earth. The Eastern Orthodox left the Church in the eleventh century and have pretty much remained unchanged since then. They only accept the early Councils of the Church as infallible, their cultural differences are non-existent, as when the Orthodox broke away from the Church, each Orthodox Church split in two, half remaining with Rome, and half going their own way; so to this day, there is a Greek Uniate Rite, an Armenian Uniate Rite, etc. Uniate rites are full rites within the Catholic Church, which like the Latin Rite, have their own Mass, their own language, and their own way of performing the sacraments. We usually only think of the Latin Rite when we think of the Roman Church but this is incorrect, the Greek Rite is every bit as much the Catholic Church as the Latin Rite is, we in the West are just more familiar with the Latin Rite as it is larger and the Rite that most of us were raised in.