Read the Church Fathers
pastebin.com/kNMtcmsi
This is a collection of all the writings by those taught directly by the apostles. It's not that much stuff so you can read through all of it fairly quickly.
Here are some good samples from various Church Fathers and why you should read them.
St. Optatus of Milevis, a great 4th century eastern father
You cannot then deny that you do know that upon Peter first in the City of Rome was bestowed the Episcopal Cathedra, on which sat Peter, the Head of all the Apostles (for which reason he was called Cephas), that, in this one Cathedra, unity should be preserved by all, lest the other Apostles might claim, each for himself, separate Cathedras, so that he who should set up a second Cathedra against the unique Cathedrs would already be a schismatic and a sinner.
tertullian.org/fathers/optatus_02_book2.htm#C2
and St. Maximus the Confessor from the 7th century
"If the Roman See recognizes Pyrrhus to be not only a reprobate but a heretic, it is certainly plain that everyone who anathematizes those who have rejected Pyrrhus also anathematizes the See of Rome, that is, he anathematizes the Catholic Church. I need hardly add that he excommunicates himself also, if indeed he is in communion with the Roman See and the Catholic Church of God …Let him hasten before all things to satisfy the Roman See, for if it is satisfied, all will agree in calling him pious and orthodox. For he only speaks in vain who thinks he ought to persuade or entrap persons like myself, and does not satisfy and implore the blessed Pope of the most holy Catholic Church of the Romans, that is, the Apostolic See, which is from the incarnate of the Son of God Himself, and also all the holy synods, according to the holy canons and definitions has received universal and supreme dominion, authority, and power of binding and loosing over all the holy churches of God throughout the whole world."
books.google.com/books?id=_rHqBgAAQBAJ&pg=PA553&lpg=PA553&dq=
Also note Orthos don't really have any idea of confession so don't worry about it, they don't have any idea of mortal sin or what actually needs confession.
Here's some samples
Just as a physician might see you and diagnose an illness and then prescribe therapy that includes many components, (for example medication, diet, physical therapy & counseling) which all are targeted toward the goal of recovery so also the spiritual condition might be diagnosed in confession, and various spiritual remedies prescribed by the confessor.
And one of those spiritual remedies may be to refrain from receiving Holy Communion for a time (just as a physician might temporarily restrict your diet for a particular purpose) or perhaps the remedy prescribed might be to receive Holy Communion (like taking medication - or to stay with the diet analogy, to eat the proper nutritional foods).
orthodox.net/articles/confession-and-communion.html
Another friend told me that he was so worried about all he had to confess that he decided to write it down. “So I made a list of my sins and brought it with me. The priest saw the paper in my hand, took it, looked through the list, tore it up, and gave it back to me. Then he said ‘Kneel down,’ and he absolved me. That was my confession, even though I never said a word! But I felt truly my sins had been torn up and that I was free of them.”
theophany.org/orthodox-faith-confession.php
Mocking confessing all your sins, it's just sacreleige
Also more relevant to you they don't take seriously hiding what you said in confession
Compare whit the Catholic view
It is a crime for a confessor in any way to betray a penitent by word or in any other manner or for any reason”
confessors are forbidden, even where there would be no revelation direct or indirect, to make any use of the knowledge obtained in the confession that would “displease” the penitent or reveal his identity
And if a priest does this ONLY the Pope can forgive him.
It's not just some random people no one care about saying it's important "under strong constraining influence", it's in the law and if they ever do it they literally have to the Pope and be forgiven to not go to hell.