The Lord surely is the God of all.
And if orthodoxy was simply incense, fancy robes, and chants, I wouldn't be interested in it. It isn't about the rituals and embellishments. That isn't what our faith is about.
The Christian walk is far more about what goes on internally than what goes on externally. One of the purposes of the liturgy is to make visible what is invisible. How can I explain that?
But an orthodox liturgy will show you the proper approach one should have before God in worship and in prayer. Yes, it is something passed down for the edification of the church.
There is a purpose behind everything. From what the clergy wear, to the actions being done, the color schemes of everything, the numbers we use, etc.
We like to use symbols. We use typology to teach the faith. We use parables. Why though?
Everything about orthodoxy is a mystery to be experienced. It isn't about having a bunch of head knowledge, vain ritualism, or having the most exotic incense. It is a way of life that we take wherever we are, whether with others or in private.
The Eternal Way of Truth is the religion we teach, and it is true religion. It is primordial religion. There never has been a time when there wasn't true religion, because true religion was created by God, not man.
Certainly, we have stories we use, texts we draw from to teach. We have The Holy Tradition, which is the faith itself, and we have customs. Even customs that vary among the nations. We have a culture, certainly. Humans are cultural creatures, and there is a reason for all these things. Passing down what is important. The faith isn't simply for the educated elite. It is for everyone, even the simple. The illiterate. Children. It is a faith that anyone can come to know and experience, regardless of their sophistication.
How does one communicate The Uncreated and Eternal God, The Ultimate Reality through the medium of that which is temporal, created, and ultimately unreal? It is an absurd task. It isn't man that communicates God, God reveals Himself in the mystery. It's very personal. No one can do the work for somebody else. I can not make anyone's heart pure to see God. I can not abide in The Way for someone else. To be a Christian, one must take the cup of suffering in front of them and drink it themselves. One must pick up their own cross, and carry it.
The Orthodox Catholic Church is the original church, founded by Christ Himself, passed down from the apostles through the bishops, being the oldest and longest lasting continuous international organization in world history. The gates of hell will not overcome the church.
So who are these "Christians" outside the church? They are the descendents of those who were kicked out of the church. If they follow after those who were kicked out of the church, how can they be in it? If they are not in the church, how can they be Christian?
The symbol of faith, the very ancient creed of the church expressly makes the church an object of faith. "I believe in One, Holy, Catholic, and Apostolic Church."
What that makes very clear is that denominationalism is a heresy. Orthodox Christianity is not a denomination of Christianity, IT IS Christianity.
There is nothing about God that is a hypothesis. God is the surest there is. If you want to be confused by the many so called "Abrahamic religions" as the academics say, at least don't be confused by Christianity. There is only Orthodox Christianity. Nothing else calling itself Christian can be properly said to be so. You learn to spot counterfeits by studying the real thing, not by studying counterfeits.