He really knows about Catholicism though.
He may know Catholicism, but does he accept it and all that it teaches? If not, his knowledge only make him that much more guilty of heresy.
And the Zoghby initiative, on his signature, is when an Eastern Catholic priest (in communion with Rome) worked to establish communion as well with the Orthodox, in a step toward Orthodox-Catholic unity.
Is he in communion with Rome? If so, why does he call himself an Orthodox? And why is he objecting to the addition of the filioque when, according to the Council of Florence (which Catholics are bound to believe) it was added licitly and reasonably?
Unity is founded on the same faith. There can be no Christian unity with those who reject dogmas revealed by God, since those who reject what Christ taught are, by definition, not part of the Church - they are heretics.
We need people like this, because the Orthodox has apostolicity as well, and their communion is valid, but illicit, in the eyes of Rome. For example, if we’re in rural Russia somewhere we are allowed to attend an Orthodox liturgy as long as the priest gives us the ok.
It doesn’t matter if they have apostolic succession. What heresy in the first 1000 years didn’t? What you may not understand is that Orthodox are heretics and schismatics; and it id de fide that all heretics and schismatics will go to hell, unless before death they enter into the Catholic Church.
We all desire unity, but the way this is achieved is by those outside the Church (the Orthodox, for example) renouncing all of their errors and returning to the Roman Catholic Church, outside of which is no salvation. That is the only way for a true unity to be achieved. Any pretended unity with a group who does not accept all of the Divinely revealed truths is a false unity.
But my reason for even posting in this thread is because a self professed Orthodox (a heretic and schismatic) was warning about sermons given by the SSPX and FSSP.
For an Orthodox to warn Catholics about the SSPX is similar to a member of a nudist colony warning other members of his community that they should not go into the next town because people are dressing immodestly.