What does the Eastern Orthodox Church believe?
What does the Roman Catholic Church believe?
I believe (I may be wrong) the Protestant churches believe the Five Solas of the Protestant Reformation
Sola Scriptura- The belief that Scripture is the rule of faith, not creed.
Sola Fide- The belief that faith justifies the individual, not works.
Sola Christus- The belief in the substitutionary atonement of Christ in place of the sinner.
Sola Gratia- The belief that salvation is a work of God's grace alone, not human assistance.
Soli Deo Gloria- The belief that one should live under the lordship of God alone.
Five Solas | Theopedia
My hope is that we can come to appreciate each other's differences and understand each other better as we are all one in Christ Jesus.
Ok I'll take a stab (my understanding, as a fledgling EO and former Sola Scriptura Protestant) -
The big thing that you are missing is that both the EO and RCC are from a single line that was apostolic. The apostles were essentially the first Bishops, even though they may not have had the formal title. They administered the sacraments of the Church. Other bishops and priests were appointed by existing bishops as the body of believers grew.
"Wherever the bishop appears, there let the people be; as wherever Jesus Christ is,there is the Catholic Church. It is not lawful to baptize or give communion without the consent of the bishop. On the other hand, whatever has his approval is pleasing to God. Thus, whatever is done will be safe and valid."
Ignatius of Antioch - Wikipedia
He lived 35AD-108AD. He was close in timeline to the original apostles and Paul. Tradition holds that he was a disciple of the Apostle John.
The different gospels and letters circulating over the first couple of centuries were reviewed by the bishops of the Church for inclusion in what became the Bible. I think you are looking at about 4th century(?) before you have them assembled.
From an EO perspective: "The Bible is the supreme expression of God's revelation to the human race, and Christians must always be People of the Book. But if Christians are People of the Book, the Bible is the Book of the People; it must not be regarded as something set up over the Church, but as something that lives and is understood within the Church (that is why one should not separate Scripture and Tradition). It is from the Church that the Bible ultimately derives it's authority, for it was the Church which originally decided which books form a part of Holy Scripture; and it is the Church alone which can interpret Holy Scripture with authority" ~Metropolitan Kallistos Ware, The Orthodox Church
Ecumenical Councils of the Bishops provide the Creeds and other interpretations. Otherwise, if someone just took the Bible and ran with it outside the Church structure, I don't know you might have 400 or 500 denominations running around all saying slightly different things that were way different... and maybe not what was intended or handed down from Christ to the apostles
As far as EO is concerned, 'the Pope' was the Bishop of Rome. We considered him 'first among equals' in terms of his bishop-ness as a nod to his lineage from Peter. But over time it seems like he claimed more than a nod. EO doesn't have or want or believe in a Pope equivalent, and RCC split from us in 1054. (I think? there were some earlier splits over various interpretations of the man-God nature of Christ that resulted in the Oriental Church and Coptic Christians)
RCC Crusaders also burned our frickin' capital in the 4th crusade!... not that we are still bitter about that...
But that's why it's Istanbul, not Constantinople. ...Thanks guys. The Byzantine Empire never really recovered from the sacking and eventually fell to Islam. I found when I looked at the persecutions EO endured under Islam and later communism in Russia, it embodied the sacrificial nature of Christ in a way I had not seen before. 'This Church has gone through trauma' was something that came to my mind as I read the history.
I will say that there is AN INCREDIBLE WEALTH of writings and prayers and traditions and theological thought by the early church fathers, St Athanasius, St Basil the Great and many others that ANY Christian can benefit from. Many of those are shared by RCC, we have a thousand years of common tradition and communion and teaching. RCC 'evolved' more for better or for worse. EO is pretty much what EO always was and what EO always will be. I would not have even found EO if it wasn't for RCC, so credit where credit is due
Both EO and RCC are intensely Liturgical. Communion is a sacrament and is Sacred to a degree that I did not find emphasized in non denominational Protestant churches. We believe He meant what He said. RCC Mass or EO Liturgy - these are prayer services centered around the Holy Communion. Those prayers, when you stop and think about them, have been prayed for the last 2000 years. It's the biggest prayer that has even been prayed. 'Whatsoever ye ask of the Father...' Take a good look at what is being asked for... That ceremony and those prayers are the very heartbeat of the Church. The Liturgy we read is the Divine Liturgy of St John Chrysostom. It is circa 400AD.
The Divine Liturgy of Saint John Chrysostom - Liturgical Texts of the Orthodox Church - Greek Orthodox Archdiocese of America
Sola Fide - the belief that faith justifies the individual not works
I think that EO would say that works are an excellent expression of faith. Where as some non-denoms might say 'I am saved', an EO would say, Christ is in the process of saving me. I am partnering with him. How am I doing that? By participating in the sacraments of the Church, and pursuing my own spiritual walk and allowing Him to transform me. Allowing the Holy Spirit to grow. Tending the garden. EO encourages things such as fasting and morning and evening prayers, as well as meditative forms of prayer, particularly 'the Jesus Prayer'. Similar in nature to Hail Mary's I think
Myself, I am a sober alcoholic in AA and we have a saying 'it works if you work it (and it don't if you don't)'. Coming back to any kind of Church after 20 years was the last thought on my mind. AA encouraged me to seek a Higher Power though, and in prayer when I asked, God gave me two things that eventually led me to EO:
Rule #1: A Disciple needs discipline
Rule #2: You don't get to make the rules.
Those 2 things (and a brief relationship with an RCC that started me really exploring Church history) led me to EO, which is where I personally belong.
For the rest of my Christian brothers and sisters I would say Luke 9:49-50. Love you all.
But if you are really curious about EO, check out the excellent books, The Orthodox Way and The Orthodox Church. You may find something you've been looking for.