**Why did most of the great heresies come from the east?
**
Is there any logical reason for this? Church governance or something of the sort that allowed for so many heresies to creep in?
It’s hard to understand what you’re asking.
There are still quite a few churches in the Middle East and southern Asia that are non-Chalcedonian. Some of them hold miaphysite (single nature of Christ) and some of them hold diophysite (dual irreconcilable natures of Christ) views of Christology. These churches generally followed bishops that did not agree with the majority of bishops at the Council of Chalcedon.
These groups hold ancient beliefs about the nature of Christ, many of which didn’t get turned into doctrinal statements until hundreds of years after Christ. We do see some evidence of heretical claims in the Bible, for example, in 1 John 4: 1-2, it says:
“
Beloved, do not trust every spirit but test the spirits to see whether they belong to God, because many false prophets have gone out into the world.a This is how you can know the Spirit of God: every spirit that acknowledges Jesus Christ come in the flesh belongs to God,”
This may reflect docetism, the belief that Jesus wasn’t really the physical incarnation of the divine, but just his appearance in human form. In fact, a form of docetism may be where Islam got its (false) narrative that the first followers of Jesus didn’t believe that he was the Son of God incarnate, and the Quran’s claim that Jesus was taken up to heaven without really dying.
Most of the Christians that followed such churches were in the Middle East, Turkey, North Africa, and Central Asia. When Islam arose, those Christian lands became part of the
Dar al-Islam (House of Islam), and most of the residents became Muslim.
There are still such Christians in the Middle East. The non-Chalcedonian groups of which I’m aware are the Coptic Orthodox Church (Egypt), the Armenian Orthodox Church, and the Church of the East (Iraq, Syria, Iran, China). There are also some Malabar churches in India that are non-Chalcedonian. Some of the groups that were originally non-Chalcedonian have reconciled with Rome, while others have remained independent. I’ve heard it speculated the the Maronite Church of Lebanon is a church that was formerly miaphysite and is now Chalcedonian.
We should embrace these Christians as our brothers and sisters, not condemn them as heretics.