Three-in-one makes no sense and is pagan. Look up the Council of Nicea and the Council of Constantinople. It is a man-made idea and runs contrary to everything G-d said about Himself.
The trinity is difficult to understand because it defies logic and is impossible.
G-d never became a human.He made that very clear. THAT is not too difficult to grasp. I can prove this by quoting verses if you’d like.
So you assert the Messiah is not human. If not, what is He?
Better yet, study how Israel will know her God.
When the time comes, you will understand.
Understanding everything about God can be a fairly daunting task. One reason He reveals Himself in three persons is to help us understand how we are to have fellowship with Him.
BTW, the concept isn’t pagan. It’s Christian. Let’s at least be intellectually honest about its association.