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It is clearly monotheistic; yes, it's a tricky and sometimes confusing monotheistic viewpoint. But it is monotheist nonetheless.
If that is true,
(that theologians supporting the trinity say man can not understand it) then why it is it a well-defined concept, and why can I understand it?
The "trinity" concept confuses the truth of the Godhead by making the three offices of the one God, three separate persons which makes three Gods.
That is polytheism, not monotheism.
Worse than this, the trinity substitutes the name of God in which lies all the power for useless, meaningless titles.
These titles could apply to anyone or anything.
God...as Swarm has just pointed out a few post back, is just a generic title that could stand for any cults' god. That much is very true.
It means; "an object of worship"
Without the name it could be anything, even a block of wood.
The trinity error attempts to deny the revelation of the true name of God, and use only titles.
Father, Son, Holy Spirit....none of theses are a specific name.
The Name of God and the revelation of that name holds the power because it specifies which God you are worshiping.
The trinity destroys that revelation to the people making the word of God of non effect.
The Bible said that Satan desired to sit in the temple of God and be worshiped as God.
It wouldn't be the first time God's people have had their eyes blinded by the god of this world, and thought they were worshiping God, but their worship was in vain.
This "trinity" is a modern day version of what was done in Elijah's day, when King Ahab and Jezebel had subverted the whole nation of Israel away from the worship of the one true God and had them worshiping the gods of the grove and Baal with 850 schooled false prophets.