Simple answer: the teaching is wrong. Of course that's a real "no go" zone right there. People get really worked up defending the trinity doctrine. After all, it's been around so long, who could possibly question settled doctrine.
Matthew 9:1-7
1 And he entered into a ship, and passed over, and came into his own city.
2 And, behold, they brought to him a man sick of the palsy, lying on a bed: and Jesus seeing their faith said unto the sick of the palsy; Son, be of good cheer; thy sins be forgiven thee.
3 And, behold, certain of the scribes said within themselves, This man blasphemeth.
4 And Jesus knowing their thoughts said, Wherefore think ye evil in your hearts?
5 For whether is easier, to say, Thy sins be forgiven thee; or to say, Arise, and walk?
6 But that ye may know that the Son of man hath power on earth to forgive sins, (then saith he to the sick of the palsy) Arise, take up thy bed, and go unto thine house.
7 And he arose, and departed to his house.
"son of man" = human being ב"א (בֵּן-אדם) ben adam, the first entry on this dictionary (abbreviations) page.
Not that complicated. See all the billions of words and quoted texts used to build the trinity sandcastle doctrine? Not one stone will be left upon another. High tide incoming. Time really is quite short.
A certain human could come right along and say to the sick, demoralized, and broken-hearted, "your sins are forgiven", and yet the power behind that statement would surely anger a lot of folks. Those scribes (ha, the very people writing down all the words of Scripture over and over and over) were none too pleased with the "obvious" blasphemer in their midst.
History repeats.
In case the above is falsely used by someone as evidence of omniscience...
Example: Who, when relating a seemingly unbelievable report to another, and then seeing the unspoken reaction (facial expression, body language) -- the raised eyebrows, the look of scorn or suspicion -- wouldn't then be inclined to remark, "Okay, I know what you're thinking, but..."
It would be pretty nutty for the person who doubts to say, "You know my thoughts? Oh, so you must be God then."
Yet much Biblical interpretation depends on nutty disconnects like that. Confusion takes hold and then experts keep it going with, "It's an incomprehensible mystery so you just have to take it on faith". Well why all the repeated teachings pounded in.
Kind of like swallowing maintenance meds [that do God knows what in the long-run] instead of making lifestyle changes that would rectify a lot of damage and prevent further destruction. Many are unwilling to make a change to fresh wholesome food and a little exercise.