I must admit I don't really believe that's the (only) reason why he left the Church, since it projects a mindset already essentially Protestant back into time to the period when he was Orthodox. I'm pretty sure he was raised in an ethnic parish where he did not understand the liturgical language, which I sympathize with as I know this could be very frustrating and it seems he wasn't catechized very well.
It probably doesn't have anything to do with the liturgical language. I was raised Roman Catholic, and as a teenager this message of a personal relationship with God resonated with me. I had never understood the faith to be something inward or personal. But I also hadn't been going to church for about a year or two, and then was forced to attend my father's Baptist church for about a year before finally letting go and dedicating my life to Christ. Much of it likely also had to do with me "coming of age." As a teenager, for the first time one begins to see many things with adult eyes, and to make things inwardly real for the first time. Perhaps I just didn't have the opportunity to do that yet as a Roman Catholic, or even to hear their side of the story.
Ultimately, I have decided that I hate all of this so much, and I just want to hole up and pretend all of these conflicts don't exist. Most of my Christian friends, including my wife, are Protestants, and I hate the division that exists between them and me now.
My sister was also raised Roman Catholic, but she never lived her faith in a proactive, inwardly motivated way. She just went week after week without understanding anything or caring much about Christ. So how can I not be happy for her now that she is reading her Bible, praying daily, and sharing her faith with everyone around her? I want to be happy for her, but I feel like because of Orthodoxy I can not. Instead I find myself being critical of almost every aspect of her church. The sentimental lyrics where Jesus runs his hands through your hair and basically is about to put his tongue down your throat, the laser light show, the emotionally stirring rock band crescendo at the same time each week, the "speaking in tongues", et cetera. Rather than being full of joy for her giving herself to God in a deeper way, I instead feel like a puffed-up know-it-all concerning the errors of her sect, and rather than sharing in her joy in Christ I want to give her a lecture on Church History and Apostolic authority. This is the one huge thing that makes me hate Orthodoxy and want to run away. It's an instant wall between all of my friends and family, but most especially my dear wife.
But I also know that there is no way that I can go back to being a Protestant; not knowing the things that I know now. So I feel like I have the fullness of Truth before me as a path in Holy Orthodoxy, but whenever I fully embrace it I will be destroying my life, social connections and familial network, all of which are Christian. I am probably going to have to do this alone, spending the rest of my life essentially alone, spiritually estranged from my wife and children, as well as everyone else I know. I don't have the heart to argue with a single one of them about this. I don't have the heart to engage in rational debates with them about church history or authority, because I don't think most of them are after Truth, but rather what is comfortable, familiar, and brings them happiness. Or perhaps I am the deluded one, or we are all deluded by superstitious tales. Either way, the mere mention of these issues and the strife they cause in my heart has already robbed me of the joys of the Resurrection. May God forgive my pitiable state and save us all by the work of the Holy Cross.