"We believe in one God, the Father, the almighty, maker of heaven and earth, of all that is, seen and unseen."
This alone is a core belief that is a self-refutation. But derives from the concept taken from the creation story that was rooted from polytheism.. Yes it became a part of your religion.
[quote]
We believe in one Lord, Jesus Christ, the only Son of God, eternally begotten of the Father, God from God, Light from Light, true God from true God, begotten, not made, of one substance with the Father. [quote]
Who's we? This sounds like the trinity to which makes no coherent sense. And you are kind of killing your monotheism here (god from god) to which is core value of Christianity. And yes, it's written in 325 AD which doesn't bode well... But since you believe it, can you back it up? Hence, provide contemporary source other than and inside invested source to validity any of the such? And to say Jesus was the only son of GOD would be conflicting with other scripture such as the that below.. Here is where people don't have father and are born of GOD to which contradicts the "one and only who came from the "father":
John 1:1 In the beginning the Word already existed.
The Word was with God,
and the Word was God.
2 He existed in the beginning with God.
3 God created everything through him,
and nothing was created except through him.
4 The Word gave life to everything that was created,[a]
and his life brought light to everyone.
5 The light shines in the darkness,
and the darkness can never extinguish it.[b]
14 So the Word became human[d] and made his home among us.
And:
10He was in the world, and though the world was made through him, the world did not recognize him. 11He came to that which was his own, but his own did not receive him. 12Yet to all who received him, to those who believed in his name, he gave the right to become children of God? 13children born not of natural descent,c nor of human decision or a husband?s will, but born of God.
14The Word became flesh and made his dwelling among us. We have seen his glory, the glory of the One and Only,dwho came from the Father, full of grace and truth.
But if you're Orthodox, you don't rely scripture because you need to cherry pick from it form your core values..