Doctrinaire differences between eastern orthodoxy, catholicism and protestantism:
1. The Apostolic succession
a) It is definitory for the
eastern orthodox belief because ensures the continuity with the Church based by Jesus Christ.
b) for
catholicism is also definitory.
c) with the exception of the anglicans and some lutherans,
protestantism in general refutes the apostolic succession. For the protestants, it is more important
the continuity of the apostolic teachings rather than the succession of the Holy Spirit.
2. The Bible
a) The
eastern orthodox church accepts 39 books of the Old Testament and 27 of the New Testament, but, in plus, it accepts a collection of books that aren`t in the hebrew Bible. These books are known as the "deuterocanonical books".
b) In
catholicism is the same as in the eastern orthodox church.
c) The
protestants reject these deuterocanonical books as being uninspired and they call them "apocrypha".
3. The priesthood (ministry)
a) In
eastern church, the bishops, the priests and the deacons must be men. They can get married before becoming priests, but not after. The bishops must be celibataires.
b) In
catholicism all the clergy must be men and they must be celibataires.
c) In
protestantism also, the ministry is formed by men, but there are also exceptions. The protestants can get married before or after becoming pastors.
4. The Eucharist (signification)
a) In
eastern orthodox belief it is also called The Saint Body and The Saint Blood of Christ. It is the
real communion with the body and blood of Christ (that died and ressurected), for the forgiveness of the sins and for the eternal life.
b) In
catholicism it has the same meaning as in orthodoxy. It is also called The
Eucharistic Sacrifice or
Missa.
c) For the
protestants, The Eucharist, just like the Baptism, is a
symbol of the Grace. The nature of sacrifice of the eucharist is rejected.
5.The presence of Christ in the Eucharist.
a) During the
Holy Lithurgy the priest invokes the Holy Spirit to transfigurate the bread and the wine in the Holy Body and the Holy Blood of Jesus Christ. The precise manner by which this happens is a
divine mystery.
b) Same as in orthodoxy, the
catholic priest invokes the Holy Spirit during Missa. However sanctification of the bread and wine becomes effective through the priest acting in the person of Christ. The bread and wine actually change into the Body and Blood of the Savior, and this change is called
transubstantiation (the gifts remain the same but their substance is changed).
c) In
protestantism, the bread and wine are
symbolic and do not change the substance.
6. Receiving the Holy Eucharist
a) In
orthodoxy, Holy Eucharist is offered only to those baptized, after confession of their sins through the Sacrament of Confession and after receiving the spiritual blessing. Christians partake of the Body and Blood of the Lord at once while the orthodox clergy partake with each, the Body and the Blood, separately, from the Holy Disc and from the Holy Grail.
b) In
catholicism, Holy Eucharist is offered to the baptized without making the confession through the Sacrament of Confession. Christians receive only the body (bread) and priests receive the blood (wine). Some Catholic churches partake of both.
c) In
protestantism, Eucharist is offered to all Christians who feel ready to receive it. The vast majority of Protestants partake with both bread and wine.
7. The Holy Spirit
a) In
orthodoxy, it is the third Person of the Trinity, proceeding from the Father according to the Nicene Creed (I and II Ecumenical Council). Father sends the Holy Spirit through the Son.
b) In
catholicism, The Holy Spirit proceeds both from the Father and the Son (filioque dogma, which means "from the Son, also").
c)
Protestants believe the same as the catholic church.
8. Holy Mysteries (or sacraments)
a) The
Orthodox Church has seven Sacraments and several religious services. These sacraments are: Baptism, Chrismation, Eucharist, Confession, Marriage, Extreme Unction and Ordination.
b) The
Catholic Church has the same sacraments as the Orthodox Church just that the Chrismation is called
Confirmation and is not officiated immediately after the Baptism, but after the age of 7 years.
c)
Protestant churches have two Sacraments:
Baptism and the
Eucharist called Holy Communion or Lord's Supper.
9. The Effect of the Holy Mysteries
a) Through the Holy Mysteries, the
orthodox christians share God's grace and become stronger in making the good, with the ultimate aim of
deification.
b) The Holy Mysteries are effective signs of grace. They are instituted by Christ and handed over to the Church; they grant
eternal life in the
catholic belief.
c) There are many opinions about Holy Mysteries in
Protestant churches. However, most Protestant theologians see the sacraments as symbols and reminders of
Grace that was already given to us.
10. Salvation
a) Salvation is love expressed through good works and is seen as a long process. The highest purpose of
orthodox christian is
deification. This communion with God is reached through
ascesis (leaving sins, fasting, praying, reading the Holy Scriptures and the writings of the Fathers etc.)
b)
Catholics are saved by
grace and through the merits they obtain by pleasing to God and practicing the
charity (love for the other one). As in Orthodoxy, salvation is seen more as a long-term process than an event.
c) In
protestantism, Salvation is a
free and an
undeserved gift given by God to man. Is obtained only through faith in Christ and by leaving the sin.
11. The Saints
a) In
orthodoxy, saints are people that pleased God with their lives and people that reached a high spiritual state. Saints are intercessors before God for those on earth.
b)
Catholics have the same belief as the orthodox christians.
c) In
protestantism, all Christians are saints, called to follow (imitate) Christ. Only Christ is the mediator between man and God.
12. Mary - Mother of God - The Ascendence to the sky
a) The
orthodox church affirms that Mary was born by her parents in a human way. She suffered physical death, like all people, but her body and soul have been raised by Christ up to heaven, to the Holy Trinity.
b) The
catholic church believes in the "Immaculate Conception" of Mary. They say she was born not from the phisical communion between man and woman but from the Holy Spirit, just like Jesus Christ.
c)
Protestants reject both both orthodox and catholic beliefs. The only one whitout is Jesus Christ.
Folks, my work here consists only in translating what I have read on a romanian orthodox site. Please, forgive the inherent mistakes; there are a few more differences that I have left outside out of laziness so, again, please forgive.
To be continued.