The liturgy of the West Syrian churches derives from Antioch, although some elements are believed to have come from the Jerusalem church of which James, the brother of Jesus, was the head. The tone of the liturgy is optimistic, and different parts anticipate the triumphal return of Christ.
I’ve presented many a sermon over the years on Biblical Christology, and recently I read an excellent synopsis (from Tabletalk/Ligionier Ministries) of Christ’s divine-human nature. Indeed, the quickest way to identify a non-Christian cult, false teacher, or off-base religion is to simply see what they teach about who Jesus was/is!
The Council of Chalcedon, the fourth recognized council, in 451 condemned Eutyches. It also recognized the equality of the bishops in Rome and Constantinople.