The Coptic Faith, isn't it different from us Orth. Christians in the sense that the Coptics believe Christ isn't in fact God, just His 'Son?' I believe I was once told that this distinct is what really 'separates' us in terms of faith.
I ask, only because I read anything pertaining to Orthodox Christianity only, although I find this book by the Coptic priest as very enlightening.
No. We believe that Christ is fully God and fully man, not just God's Son (what you described is more like Arianism). The "difference" between us and the Eastern Orthodox concerns the acceptance of the Council of Chalcedon and its dogmatic definition on the two natures of Christ.
Then doesn't this theory dispel the belief of the Holy Trinity? How can you believe in the Father, the Holy Spirit, but not believe in the Son?
Our Lord, God, and Saviour, Jesus Christ, is my God, and is the God of Fr. Athanasius! We would never deny this, we are Christians!
We believe in the Holy Trinity: The Father, the Son, and the Holy Spirit, One God.
The Logos of God, i.e. the Son, took flesh, and we confess the One Nature of the Incarnate Logos, who is perfectly human and perfectly divine, coessential with the Father in His divinity, and consubstantial to us in His humanity!
It was St. Athanasius, a Copt, who defeated Arius' wrong teaching that the Son is less than the Father.
It was St. Cyril, who confessed this One Nature of the Incarnate Logos, against Nestorius.
Some have accused us of denying the humanity of Christ because we speak of the One Nature of the Incarnate Logos, saying that we must mean that the divinity swallowed the humanity, since divinity is greater than humanity, so in a union it must overwhelm. But this is not what we believe. St. Cyril, who we both hold as a pillar of the Church, confessed the One Nature of the Incarnate Lord. We confess that He is perfectly human and perfectly God, we just don't tend to speak of His humanity and divinity as separate after the hypostatic union, but speak of the one nature of the Incarnate Lord after the hypostatic union of the divinity and humanity. We did not and have not accepted Chalcedon because of a fear that the language can be understood in a way that leads towards Nestorianism, dividing Christ's humanity and divinity... But certainly this is not how the EO understand it. I believe the same as the OO, and I believe the same as the EO, that Christ is perfectly human and perfectly God, and I pray for unity and an overcoming of the old misunderstandings, that were often politically motivated disputes.