First, let us look at the definition of “being” since this seems to be what this debate has been focusing on so far. Wiktionary gives us 5 definitions:
- A living creature.
- The state or fact of existence, consciousness, or life, or something in such a state.
- (philosophy) That which has actuality (materially or in concept).
- (philosophy) One's basic nature, or the qualities thereof; essence or personality.
- (obsolete) An abode; a cottage.
Definition 1 isn’t going to help because “creature” has the same root as “create,” and God is the one uncreated Being. Definition number 5 is obsolete and has nothing to do with this debate, so we will definately ignore it. In my opinion, definition 4 is probably the best.
“And in one Lord Jesus Christ, Son of God, the only-begotten, born of the Father before all ages. Light from light, true God from true God, begotten, not made, one in essence with the Father; through Him all things were made.”
The Son is of the same essence as the Father, therefore one being. Your human analogy just doesn’t work. Human are all different, it is part of their basic nature. But God’s nature is not to be different but the same. I’ll explain it more clearly. The nature of a human is to be a distinct human, but each person of the Trinity has the simple nature of being God, which makes them the same being.
Also, you said that the Trinity would make God divided, but this is absolutely false. Each person of the Blessed Trinity is fully God. This doesn’t mean God is composed of parts. Modalism, on the other hand, would make parts of God and give Him different roles.
Finally, I’m not sure what you mean when you say “God has personally informed me that western Christianity is more correct.”
If you believe that the Bible is God’s word, then I can use arguments from the Bible too.