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That’s not at all what I asserted or said and since my exact words are readily available I have to wonder why you wou would say it is.

Because your exact words are written in such a way as to leave me with some doubt. So that the there is no doubt, I will as a simple Yes or No question:

Did the early church fathers in the first and second century AD, in the time before Justin Martyr and Origen, stray from the teaching of the Apostles by teaching the Trinity?

Not to make blanket statements but writers like Origen evidently did even if not in the formulations of later years.
Plato too was quite influential and, of course, held in great esteem and and that included these early writers, the Catholic Encyclopedia calling them “Platonists”.

Around the Mediterranean in pre-christian times triads of gods were common and a part of Egyptian, Etruscan, etc., religions and the converts weren't always asked to give up their pagan beliefs. But no problem according to John Henry Newman in his famous essay on doctrine,

“....the rulers of the Church from early times were prepared, should the occasion arise, to adopt, to imitate, or sanction the existing rites and customs of the populace, as well as the philosophy of the educated class.”

Note well that last sentence.

As Paul noted, some of the future “kings” wanted to begin ruling right immediately, the inroads of false teachings making inroads even then.