Well, I could start with the promotion of Universalism, cherry-picking Scripture and quoting the dissidents to patristic consensus on this thread.
In my own life, the most devastating has been the embrace of sexual anarchy by Orthodox Christians around me, and close to me, including family members, as well as hierarchs. The anarchy ranges from the promotion of the alphabet soup to the general approval of divorce between practicing orthodox Christians to the promotion of feminism in general, and support for these things, directly or indirectly, including on platforms like ancient faith ministries.
The promotion of leftism in general in the Church. The promotion and praise of hierarchs, who support things like the racist BLM, and forced drugs, masquerading as vaccines, of human evolution, and so on. It’s hard to know where to stop.
Are you aware that the term
consensus patrum was first coined by Calvinists*? Within Orthodoxy we have Holy Tradition, which is explicitly defined from specific sources, starting with the sacred scriptures (the Gospels, Epistles, Psalms, and contents of the liturgical
Prophetologion being of particular importance), then the liturgical texts, then the acts of the Ecumenical Councils, then the canons of the Councils and the Fathers compiled in the Pedalion, then the Patristic writings, and so on.
There are cases where two legitimate opinions can be held by an Orthodox Christian without incurring anathema or excommunication, on certain issues which were not addressed by the Fathers or the Ecumenical Synods and have not been definitively settled by the canonical church at present.
For example, I very much wish we would require Eastern Orthodox churches to not use either the Violakis Typikon or the Revised Julian Calendar, due to technical problems with these, specifically the manner in which the Revised Julian Calendar, unlike the Julian and Gregorian calendars, makes a Kyriopascha impossible, and also causes the Apostles Fast to be in some years of negative duration, and also various changes in the Violakis Typikon that Metropolitan Kallistos Ware described as “ill-advised”, such as the movement of the Matins (Orthros) Gospel to between the eighth and ninth ode of the Canon. I greatly prefer services that use older versions of the typikon, such as the Sabaite Typikon used by ROCOR and most Church Slavonic parishes on the Julian Calendar, or the older recension of the Typikon used by the Edinovertsy / Russian Old Rite Orthodox, such as the very friendly people at the ROCOR Church of the Nativity in Erie, PA, under Archpriest Pimen, or the slight variation used by the OCA, the Bulgarians, and others on the Revised Julian Calendar. Conversely, I also support the work of Dr. Alexander Lingas to restore the Cathedral Typikon, and I would love to see it implemented at a cathedral where it was once used that we still have, for example, the cathedral in Thessaloniki, in preparation for its eventual use when the Orthodox will some day I hope regain control of Hagia Sophia in Constantinople.
And if we do regain Constantinople, I would argue that the Blue Mosque should be converted into a church dedicated to the Dormition of the Theotokos, and the New Mosque turned into a church dedicated to St. John Chrysostom or St. Mark of Ephesus.
But on these points, and indeed on more serious issues, for example, the question of how Alexandrian hermeneutics can be applied to Genesis with regards to reconciling it with our scientific understanding of the universe, bearing in mind that according to the Gospel of St. Luke the Evangelist, our Lord showed the disciples how the Old Testament is primarily about Him, and thus as I see it everything in it should be read from a Christological perspective, yet of course this does not discount all Antiochene literal-historical exegesis; on the contrary, I have no doubt that all the events described in Genesis happened, and I believe that what is described in Genesis 1 can be fully reconciled with our understanding of science, in a few different ways, which is not true of the account of creation provided by any other religion.
But on all these points, one could disagree with me, and should if they think I am wrong, for no ecumenical council or canon or synod has authoritatively decreed on these points. There is a consensus patrum but its applicability is less certain on issues such as the specific manner in which God propagated the unvierse with light in Genesis 1:1 and whether or not the days referred to were in one sense chronological epochs, since before the Sun and Earth existed, a day would strictly speaking be meaningless; indeed since God created time as well as space, we must bear that in mind.
Also, I do believe that many of the views of various creationists including both yourself and myself, for I actually am a creationist, can be made fully compatible with our current understanding of science, by this means: God, being omnipotent, could design the universe in exact detail, as if it had existed for 14 billion years, and then assembled it in the sequence described in Genesis 1 and with regards to humans, initialized our existence as described precisely in Genesis 2 with no intermediate connection to the primates; indeed I lean towards something like this happening as I do believe that Adam and Eve were the first humans, even though I also regard evolution as a demonstrated scientific reality (but Darwin’s conception of it was somewhat erroneous, in that he misunderstood the concept of what “survival of the fittest” meant, and the idea of social Darwinism is noxious, and the specific manner in which Darwin phrased his theory I believe resulted in more frequent and severe acts of genocide in the 20th century, motivated by the psuedo-science of eugenics and the evil idea of “racial hygiene.” Now one could argue this idea lacks parsimony, and I would concede this, but I am not convinced that Occam’s Razor can be applied to a subject that directly transects an area of divine activity, given that the Universe was created through our Lord, God and Savior Jesus Christ, the only begotten Son and Word of God, at the will of His Father.
*If memory serves; I believe this point was made in an article on Orthodoxy and Heterodoxy.