The Trinity is explained in this verse...
Romans 1:20
"For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse."
The Trinity or Godhead is what things are made of.
That's what the verse says, and that what I believe.
What are things made of that consist of three components?
Atoms. Simple.
Not sure why this is even a debate.