Well the Orthodox Church simply doesn't believe in the penal substitution, that's a uniquely western idea. For one we don't believe in the inheritance of guilt of the original sin, we merely inherit the fallen state of the world, therefore we don't need to be absolved of a sin for which we are not guilty. And Christ's sacrifice isn't seen as substitutionary, that's to say it isn't seen as him being substituted for humanity to satisfy Father's wrath. Christ in the Bible is likened to the sacrificial lamb, and as a lamb that gets sacrificed gets eaten, so do we eat the body and blood of Christ after his sacrifice. It's really not a matter of what argument I could make, but how well I could explain the doctrine. But if we're really going with "Christ bore Father's wrath to appease the Father so he could forgive everyone" then how are the unbelievers not forgiven? Because they haven't "accepted" the "payment"? It's just such a convoluted, arbitrary idea.
As for confession, why don't you just ask God to read the Bible for you too? Why not ask him exactly what to do? Why not ask him exactly what to think? Why not ask him the winning lottery numbers? You'll find God isn't much of a conversationalist, despite being ever present, and how do you confess something to One that already knows everything? I think it's pretty clear, confession to a priest is a lot more dreadful of a prospect than confession to a quiet God that already knows all of your sins, who's reaction you don't have to see and who's words you don't have to hear. I imagine it will be a lot more dreadful than confessing to any person once it's time to confess right before him, on judgement day, so better confess as much as possible while here...