But the Trinitarian concept does not posit Jesus or the HS as actually being God as the Nicene Creed does show the difference between them. But, since that creed was based on a compromise agreement in order to especially bring the Arians in, it is quite vague, thus "the Mystery of the Trinity", which supposedly people will not be able to understand until they reach heaven-- which leaves me out.
Perhaps this quote from the 'Trinity' entry in
The Oxford Dictionary of the Christian Church may help:
TRINITY, Doctrine of the. The central dogma of Christian theology, viz. that the One God exists in Three Persons and One Substance.
Of course, the doctrine doesn't exist before the 4th century ─ when it was devised as a way of promoting Jesus to god status while resisting criticism that like the pagans, Christians were polytheists ─ and even now JWs, Christian Scientists, Christadelphians, Mormons and more reject it; but the Christian denominations with the big numbers teach it ─ RCC., Orthodoxy, Anglo/Pisco, Baptist, Presbyterian, Methodist &c.
This doctrine is held to be a mystery in the strict sense, in that it can neither be known by unaided human reason apart from revelation, nor cogently demonstrated by reason after it has been revealed.
That is, there's no important difference between 'a mystery in the strict sense' and 'a nonsense'.
On the other hand, it is maintained that, although the mystery is above reason, it is not contrary to it, for it is not incompatible with the principles of rational thought.
That, of course, is also nonsense. There's no such place in logic as 'above reason', and the problems are real. Each of the three Persons
is 100% of God ie not one third of God, not members of a corporate God, not directors of a separate entity called God.
So we do the maths and find that 100% + 100% + 100% = 300% = three gods. No, says the doctrine, only one God.
What about 33.3% + 33.3% + 33.3% = 100%. Nope. The Trinity doctrine requires a distinct 100% + another distinct 100% + another distinct 100% to be 100%.
To which the 'principles of rational thought' reply,
Phooey!
And here, to complete the picture, are some of the quotes from the NT where Jesus (in words attributed to him in direct speech) says he is NOT God (there being none where he says, 'I
am God' ─
Mark 12: 29 Jesus answered, “The first is, 'Hear, O Israel: The Lord our God, the Lord is one;” ... 32 And the scribe said to him, “You are right, Teacher; you have truly said that he is one, and there is no other but he;
Matthew 20:23 “to sit at my right hand and at my left is not mine to grant, but it is for those for whom it has been prepared by my Father.”
Matthew 24:36 “But of that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father only.”
Luke 18:19 “Why do you call me good? No one is good but God alone.”
John 1:18 No one has ever seen God; the only Son, who is in the bosom of the Father, he has made him known.
John 5:19 “the Son can do nothing of his own accord, but only what he sees the Father doing”
John 5:30 “I can do nothing on my own authority; [...] I seek not my own will but the will of him who sent me.”
John 6:38 “For I have come down from heaven, not to do my own will, but the will of him who sent me”
John 8:42 “I proceeded and came forth from God; I came not of my own accord, but he sent me.”
John 10:29 “My Father [...] is greater than all”.
John 14:1 Let not your heart be troubled: ye believe in God, believe also in me.
John 14:10 “The words that I say to you I do not speak on my own authority; but the Father who dwells in me does his works.”
John 14:28 You heard me say to you, 'I go away, and I will come to you.' If you loved me, you would have rejoiced, because I go to the Father; for the Father is greater than I.
John 16:23 In that day you will ask nothing of me. Truly, truly, I say to you, if you ask anything of the Father, he will give it to you in my name.
John 17:3 “And this is eternal life, that they know thee the only true God, and Jesus Christ whom thou hast sent.”
John 20:17 “I am ascending to my Father and your Father, to my God and your God.”
With which Paul incidentally agrees eg
Corinthian 8:5 For although there may be so-called gods in heaven or on earth – as indeed there are many “gods” and many “lords” 6 yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist.
Philippians 2:9 Therefore God has highly exalted him and bestowed on him the name which is above every name, 10 that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, 11 and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.
So were I a Christian, I wouldn't be a Trinitarian.