The Illuminator, an official publication of the Pittsburgh Diocese of the Greek Orthodox Archdiocese of North and South America, published this in response to a question from a reader about Baptism.:
1) The Orthodox Church receives "all those baptized in the Holy Trinity and correctly professing faith in the Holy Trinity." Faithful from the "Oriental Orthodox Churches...are accepted by profession of faith only."
2) Those coming from confessions which "profess faith in the Holy Trinity but who do not have a true sacrament of confirmation (or Chrismation), as they do not have true (‘valid’) priesthood, are accepted by Chrismation."
3) "To treat Trinitarian Christians as unbaptized heathens is an injustice committed against Christian baptism, and eventually a blasphemy against God’s Holy Spirit Who is at work at any Christian baptism."
4) "When we confess faith in one baptism for the forgiveness of sins, we do not mean by that Orthodox baptism, but any Christian baptism." The Holy Spirit is not "limited by human canonical boundaries we have established for our convenience. We cannot bind the spirit, and not allow Him to work with all the other Christians, just because some of us so decided."
5) "The Eighth Ecumenical Council restored the unity between the Eastern and Western Churches. The representatives of both Churches had agreed that the Roman primacy has to be exercised in the ‘West’...and the primacy of the Church of Constantinople had to continue to function within its own territory of the East....
"Also, regarding the Filioque clause (the procession of the Spirit and from the Son) was rejected by that Council as unauthentic and erroneous.
"The problem with the West is that later it alienated itself from the teaching and authority of this Eighth Council.
"Obviously, when the West will return to the teaching of this commonly accepted Council by both East and West, Rome and Constantinople alike, the ‘Western,’ Roman Catholic Church will basically become Orthodox again."
6) The Orthodox Church "has never formally rejected the Roman Church as a Christian Church, as some of our fanatics may believe. True, a contemporary rejection of the Roman baptism by the Great Church of Constantinople for pastoral reasons has taken place. But this was corrected and readdressed, as soon as the cause of this rejection disappeared.
"Orthodoxy and Roman Catholicism, the two ‘sister churches’ of old continue to recognize one another’s baptism, as well as the other sacraments celebrated in these churches."
7) The rebaptism by Orthodox of baptized heterodox Christians is inspired by "narrow-mindedness, fanaticism and bigotry."
