1 problem is:
The original trinity was father/mother/son, the church used the mystery religions mother son devotion and idols.
Then it became Father, word, son until it became Father, Holy Spirit, Son.
The problem with that is when Daniel has his vision, he did not claim to be the messenger giving the message, nor be claimed one with- but a part of that messenger. Nor did any prophet claim or be claimed a duality or trinity they just were Oracles of the message.
Most damaging is Rev 1:13 Jesus is claimed
"like unto" son of man. Like unto: emulation, impersonation of son of man.
problem 2; counting is off
Their early writings say;
"God will give you another with a new name", so thats a 4th portion not 3, and really 5 since they never recognized the the body-face of the first return.