Saying the Trinity is ONE GOD yet THREE persons is not mystical. It is based on the idea of Revelation. Not blind faith
Nope, that is incorrect. By that philosophy, faith and belief are synonymous, and they are not. It is mystical because it describes the Godhead like 3-in -1 oil, when it is simply 3 separate personages with three separate specific tasks, but united in purpose, but only in purpose. What most of Christianity alleges from the deep history of Christianity confuses how Paul defined faith in Hebrew's:
"Now faith is the substance of things hoped for, the evidence of things not seen." [Hebrew's [KJV] 11:1 In Greek, it is clearer: faith is πιστις [pistis], which synonyms are persuasion and credence, which is stronger than mere belief. Hope is ελπισω [elpiso] which synonyms are expect, trust. Evidence is απόδεξη [apodeixi] which synonyms are proof, conviction. Therefore, both hope - ελπισω [elpiso] and evidence - απόδεξη [apodeixi] represent words which are greater than mere belief. Faith is its own category that depends on an inner, spiritual conviction that a concept is true with sure evidence. That is in no way "blind." Period. Yes, faith, itself, is revelation, not belief. That is why faith drives one to act on it, to gain greater confidence that the quest will yield positive and concrete results. Faith precedes perfect knowledge, not just theory. If people believe faith is the equivalent of theory, they are not yet on board.
The Jews themselves used it [Elohim] to describe ONE GOD. Not many gods.
Obviously the Jews used Elohim as descriptive of both many and as one. Much like they used "day" יוֹם [yom] as a single day of 24 hours, and as descriptive of a much longer period, depending on context. For example, the "yom" of creation used the same word in days 1, 2, & 3, yet the sun and moon are not created until day 4, 60% into the creation period, so the first 3 days cannot mean a day of just 24 hours, yet. Our English translation is very undependable, which is why I say that prayer must be employed to obtain a better understanding of what is written.
can't be used to suggest that people are GODS.
No, you misunderstand. I never said "people are Gods." I said they can become as God in a distant future, didn't I? "Eternal" is a long time. Perhaps that is a word, in English, that does not have the full context of the word in Greek [αιώνιος] which is understood as "everliving," and "without beginning, and without end." That understanding does not have a "big bang" beginning. No balloon, and no needle. That is our finite mind talking, but we must get past that limitation. That is why Jesus taught that "...with God, all things are possible." THAT is an application of faith, not mere belief, that makes it possible for a mustard-seed sized amount of faith allowing us to remove a mountain to another place. Do you think he is kidding?? Look it up. He is serious. Matthew, but you find it. I've said enough.