I guess that is what is confusing from an outsider’s perspective (not being Catholic, or Orthodox either one). So, EC’s share theology with EO’s… so they don’t accept all that the Church proposes in the same way that Latin-rite Catholics do. Is that a matter of theological wiggle room? What I mean, is the I know from reading here and elsewhere that Theologians, in the course of their work, can question and probe and search within a belief.
I think the distinction is between theological perspectives and the doctrine. There is no “wiggle room” on the doctrine, but how we conceptualize it there is. For example, there are several ways of conceptualizing predestination, all of which are acceptable for Catholics, but we cannot accept the heresies of Calvanism.
Most Christians believe in “purgatory”, though only Latin Catholics tend to conceptualize it in a certain way. EO have something I have heard described as “toll houses” where the soul stops on the way to heaven. Even Protestants will agree with EO and Catholics that “nothing unclean will enter” heaven. "But nothing unclean will ever enter it, nor anyone who does what is detestable or false, but only those who are written in the Lamb’s book of life. " Revelation 21:27
But Protestants tend to think of the final cleansing - anything that remains in our souls that is not of God at the end of this life- as a purging that happens instantaneously.
" Lo! I tell you a mystery. We shall not all sleep, but we shall all be changed, 52 in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised imperishable, and
we shall be changed. 53 For this perishable nature must put on the imperishable, and this mortal nature must put on immortality. 54 When the perishable puts on the imperishable, and the mortal puts on immortality, then shall come to pass the saying that is written…:1 Corinthians 15:51–54
Latins have been theologizing about this process of transformation for two millennia so have developed more ideas about it. Eastern Christians, whether they are Orthodox or Catholic, do not try to mentalize things like Latins do, and have not had their faith influences as much by scholasticism and philosophy.
Can a person join a Latin-rite Catholic church if they believe the Eucharist is best defined as mystery, or does a person joining a Latin-rite Catholic church have to believe in transubstantiation specifically.
Transubstantiation is the conceptualization the Latin Rite has used to define and describe the Real Presence. It is a doctrine of the faith, but it is not one of the questions that is asked of people who are joining the Church. I have seen Pastors take a more relaxed view of this, so that if candidates are not able to wrap their minds around the concept, they are expected to grow into it. What the Church expects of candidates is that they accept the words of Christ at the institution of the last supper litterally, and this is consistent with what the Eastern Catholics do. After the consecration, the bread and wine become the Body, Blood, Soul and Divinity of Jesus, and he is truly and physically present. I don’t know if that helps.
I do understand there is an overlay belief of the real presence, and it is close enough to be “in communion” but it is one thing that confuses me; is it the spirit of the idea that must be assented to, or the letter of the idea.
The reason this has become such an issue here in the West is because of the Reformation. Anglicans and Lutherans also claimed to believe in the Real Presence, ,but “differently”, and quickly the concept of the sacrifice was lost. What followed is that both communions experienced a great falling away from the belief in the Real Presence, so that the Church became much more strict, especially with converts.
That being said, polls show that most American “Catholics” do not believe in Transubstantiation either, so there are many of our separated brethren who come closer to the Catholic faith in this area than baptized Catholics!