I didn't use to think this, but now I do. The trinity's like this:
You're in a cell, looking thru the bars. There is a doorway beyond the bars. When the guards come and go, they enter through the doorway. But sometimes they come from around one corner, sometimes another, so there must be a hallway beyond the door.
You and your cellmate talk about escape all the time and argue over whether, when you get past the bars and through the doorway, it would be better to go left or right.
You never get out of the cell, but you argue bitterly until the day you die. He knows it's left. You're certain it's right. Both of you can produce reasons for your belief.
Until someone gets out of the cell and walks through the doorway and investigates the hallway, you're never going to know. And no one ever gets out.
But it gives you something to do, and creates the illusion you are immersed in deep thoughts.
Since I left dubdom and began rejecting most of what I learned at the KH over the past three decades, I have come to think that the trinity "concept" appears to permeate the New Testament and that the first century Christians writing that portion of the bible were as confused as we are today about what it really meant. Subsequent church fathers struggled with the explanation as well. I recently attended an Episcopal Church and heard a learned priest talk about the trinity and tell the congregation, "It's really hard to explain and even harder to understand." He did not make it an article of faith to believe in it, merely presented it as a puzzle to work on. I liked that approach a lot, as opposed to being told what to think all the time.