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The differences between them and Roman Catholicism. These differences are so important that there has been no reconciliation in nearly a thousand years after the split. The Eastern Orthodox differ with Roman Catholicism on these issues:

The Holy Spirit (the filioque)

In EO - The third person of the Trinity, proceeding from the Father alone as in the original Nicene Creed. The Father sends the Spirit at the intercession of the Son. The Son is therefore an agent only in the procession of the Spirit.

In RC - 'When the Holy Spirit proceeds from the Father and the Son, He is not separated from the Father, He is not separated from the Son'.

Mary - Assumption and Immaculate conception of

EO - The Assumption is accepted and it is agreed that Mary experienced physical death, but the Immaculate conception is rejected. Orthodox belief is that the guilt of original sin is not transmitted from one generation to the next, thus obviating the need for Mary to be sinless.

RC - Both are dogmas of the church. The church has not as yet decided whether Mary actually experienced Physical death. The dogma of the Immaculate Conception states that Mary, was at conception 'preserved immaculate from all stain of original sin' and should not be confused with the virgin birth.

Pope - Authority of

EO - As the Bishop of Rome, he has a primacy of honour when Orthodox, not of jurisdiction. At present, his primacy is not effective as the papacy needs to be reformed in accordance with Orthodoxy. His authority is thus no greater or lesser than any of his fellow Bishops in the church.

RC - The Pope is the 'Vicar of Christ' i.e. the visible head of the church on earth and spiritual successor of St. Peter. He has supreme authority (including that over church councils) within Christendom (The Power of the keys).

Pope - Infallibility of

EO - Papal Infallibility is rejected. The Holy Spirit acts to guide the church into truth through (for example) ecumenical councils. This Orthodoxy recognises the first seven ecumenical councils (325-787) as being infallible.

RC - The Pope is infallible when, through the Holy Spirit, he defines a doctrine on faith and morals that is to be held by the whole church. This is a dogma and is therefore a required belief within Catholicism.

Purgatory

EO - An intermediate state between earth and heaven is recognised, but cleansing and purification occur in this life, not the next.

RC - A place of cleansing and preparation for heaven. Also a place where the punishment due to unremitted venial sins may be expiated.

I'd say these were the "biggies", but other differences also exist. These are explained here.

http://christianityinview.com/comparison.html

https://en.wikipedia.org/wiki/List_of_Catholic_rites_and_churches
(Alexandrian:
Coptic Rite
Ethiopic Rite
Antiochian:
Maronite Rite
(West) Syrian Rite
Malankara Rite
Armenian Rite:
Armenian Rite
Chaldean or East Syrian:
Chaldean Rite
Syro-Malabar Rite
Byzantine Rite (Constantinopolitan):
Byzantine
Latin (Western) liturgical rites:
Roman Rite
Pre-Tridentine Mass (the various pre-1570 forms)
Tridentine Mass
Mass of Paul VI (
Anglican Use
Ambrosian Rite
Rite of Braga
Mozarabic Rite
Catholic Order Rites (generally defunct):
Benedictine Rite
Carmelite Rite
Carthusian Rite
Cistercian Rite
Dominican Rite
Franciscan Rite
Friars Minor Capuchin Rite
Premonstratensian Rite
Servite Rite
Catholic autonomous particular Churches:
Latin Church with Latin liturgical traditions
Eastern Catholic Churches
Alexandrian liturgical tradition:
Coptic Catholic Church
Ethiopian Catholic Church
Eritrean Catholic Church
Antiochian liturgical tradition:
Maronite Church
Syrian Catholic Church
Syro-Malankara Catholic Church
Armenian liturgical tradition:
Armenian Catholic Church
Chaldean or East Syrian liturgical tradition:
Chaldean Catholic Church
Syro-Malabar Catholic Church
Byzantine liturgical tradition:
Albanian Byzantine Catholic Church
Belarusian Greek Catholic Church
Bulgarian Greek Catholic Church
Byzantine Church of Croatia, Serbia and Montenegro
Greek Byzantine Catholic Church
Hungarian Greek Catholic Church
Italo-Albanian Catholic Church
Macedonian Greek Catholic Church
Melkite Greek Catholic Church
Romanian Church United with Rome, Greek-Catholic
Russian Greek Catholic Church
Ruthenian Catholic Church
Slovak Greek Catholic Church
Ukrainian Greek Catholic Church)

Here, for your perusal to find those doctrinal differences on which we claim our salvation rests.

And please, let us know when you get to the part where it says *There is no salvation outside the (fill in the blank Prot denomination).*

Statements of faith for different churches

Assemblies of God
http://ag.org/top/Beliefs/Position_Papers/index.cfm#

Associate Reformed Presbyterian Church
http://arpchurch.org/documents/confession-of-faith/

Calvary Chapel
http://calvarychapel.com/home/about/

The Christian and Missionary Alliance
http://www.cmalliance.org/about/history/

Elim Fellowship Churches
http://www.elimfellowship.org/about-us/statement-of-faith/

The Father's House
http://tfhny.org/the-house/what-we-believe/

Osais LA
http://www.oasisla.org/about/what-we-believe/

Presbyterian Church in Americahttp://www.pcaac.org/resources/wcf/

United Reformed church in North America https://www.urcna.org/sysfiles/site_uploads/custom_public/custom2642.pdf

Westside Christian Fellowship
http://westsidechristianfellowship.org/about-wcf/statement-of-faith/