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The problem of the nature of God came to a head early in the reign of Emperor Constantine who, for political reasons, decided to legalise Christianity to stop the bloodshed by issuing the edict of Toleration from Milan in 313. Soon after, he declared himself a Christian and his army also Christian. This is well-known history.
However, Constantine, as is well known, wanted to use Christianity as a unifying influence on the Roman Empire but noticed that Christian leaders were squabbling over the nature of God - essentially Arianism vs Trinitarianism. So he called a council at Nicaea to settle the matter which issued the Nicaean creed which essentially decided in favour (mostly) for Trinitarianism.
Unfortunately, that did not settle the matter, as Constantine's son who became emperor after Constantine was Arian, and the next was Trinitarian. There has been an on-going dispute ever since - with more church councils and more creeds. The process exhausted itself by about the 8th century, but the debate still continues in many places. Arianism in various forms continues as a minority belief.
So, why did the majority decide for Trinitarianism over Arianism? In its simplest form, the logic goes something like this. Any theory of the nature of God must account for the following inescapable facts:
So what are we to make of all this? Historically we had only a few options which I list here for completeness:
Eventually, Trinitarianism won the majority vote over a period of almost a thousand years simply because it is the only theory that is supposed to explain all the facts without making special pleadings for a large number of texts.
I am sure the debate will continue.
Upvote:2
God revealed himself to Moses and said :
I am that I am. Exodus 3:14 KJV.
The revelation was, in part, the way in which he spoke, from a bush which burned and was not consumed. There was a living, burning flame and, separate and distinct, a living bush that did not fuel the flame, and was not consumed by the flame.
Out of that, spoke the Messenger of the Lord, Exodus 3:2, who is also God, Exodus 3:4.
By faith, I understand that here is a revelation of Deity united with humanity (a supernatural self-sustaining flame in intimate contact with that which grew out of earth and is nourished by earth).
Here is what Malachi writes of in the first few verses of chapter 3 - the Messenger of the Covenant, who is ... the Lord himself.
With the coming of the Son, the Father - also - was revealed. And the Son also revealed the Holy Spirit.
By examining, carefully, the documented words of Jesus Christ and by examining also the documented words of the twelve whom he, specifically, authorised to express the gospel, one can arrive at an understanding - if one is granted revelation through the gift of faith - of whom God is, personally, and what God is in his own nature.
He is what he is. And he has revealed what he is, to faith.
The fact that various individuals or groups of individuals have had disputes about these matters does not alter the reliability of the documentation or the reliability of the way in which faith works (by Divine revelation).
The problem is unbelief and its close companion - ignorance.
Upvote:3
"how many "forks in the road" could have gone another way, and why didn't they?"
Why do you think they didn't go another way?
Binitarians believe that the Father and the Son are both God, but the "holy spirit" is simply their spiritual force in action, not a separate being. (e.g. Church of God: Is God A Trinity?)
Unitarians believe that the Father is God, but Jesus isn't. (e.g. Jehovah's Witnesses: Should You Belive In The Trinity?)
P.S.
The Trinity doctrine wasn't formalized by the Roman Church until 350 years after the Crucifixion. The Harper-Collins Encyclopedia of Catholicism's article "God" says:
Council of Constantinople (381) [affirmed] the divinity of the Holy Spirit, which up to that point had nowhere been clearly stated, not even in Scripture
There were many other ideas about the nature of God at that time, but once an official position had been taken, anything not following the party line was considered heresy, and anyone expressing other views would face excommunication. Emperor Theodoseus declared:
We authorize the followers of this law to assume the title of Catholic Christians; but as for the others, since, in our judgement, they are foolish madmen, we decree that they shall be branded with the ignominious name of heretics, and shall not presume to give their conventicles the name of churches.
So to answer the original question, the Trinity Doctrine needs to be what it is now, because that's what the Roman Church decided it should be.
Once one has accepted a doctrine, it is far too easy to fall into the trap of interpreting scriptures in a way that supports it (eisegesis), rather than assuming nothing to start with and then using scriptures to derive the truth (exegesis). This is comparable to the old and new methods of crime investigation: decide who did it and then put all your effort into finding enough evidence to convict them in court, versus, put all your effort into finding as much evidence as possible, and use that evidence to deduce who did it.
More details about the process of the development of "Trinity" can be found in The Surprising Origins of the Trinity Doctrine.