I gathered that from some of your comments. That’s why I inquired what those who do say they are trinitarian have explained to you about their deity.
Ah, okay, now I see what you are asking.
The essential argument for the trinity, in the very simplistic way I understand it, is that the Father is the binding force of all things. I suppose you could say that it is God's primary consciousness. The Son is the Logos of God, which is, I suppose you could say, like a meditative train of thought, but on a cosmic scale, which causes things to come into existence, then you have the Holy Spirit, which is the Final Cause, which acts within those who have already achieved salvation.
If everything is inside God, then what does that make us? Where does this consciousness of ours come from? What makes us real? Nothing exists outside of God's consciousness. So this consciousness of ours comes from God's consciousness.
God is only one person. God is in me, and in others, but neither I nor they are him.
God is in you indeed, and what is the nature of God's presence in you? God's presence in you is to give you consciousness. You cannot think of yourself and God as being separate, or that there is any part of you that is not part of God.
Here is a question: why do the commandments require us to be kind to one another? If God is on a cloud, completely removed from Man, why does He care about what evil men do? In fact, here is a better question: why do men exist at all, or anything else for that matter? There is only one possible answer: to experience it. God is in us to experience life, and we have the power to create any possible experience, to make this world a beautiful adventure or a complete hell. This is why God is just: because whatever you inflict onto others you inflict onto yourself.
Genesis 9:6
“Whoever sheds human blood,
by humans shall their blood be shed;
for in the image of God
has God made mankind.