Ignatius of Antioch was a student and disciple of the Apostle John whom God trusted the book of Revelation.
Note below from John's disciple some of the different errors that were creeping into the early Church. Would John have corrected Ignatius if he was in error?
And most significantly, note that Ignatius did not believe that the Father, Son and Holy Spirit are one god or that Jesus was co-eternal with the Father. And since Ignatius was John’s disciple, what did John teach his student?
“They introduce God as a Being unknown; they suppose Christ to be unbegotten; ... Some of them say that the Son is a mere man, AND THAT THE FATHER, SON, AND HOLY SPIRIT ARE BUT THE SAME PERSON, and that the creation is the work of God, not by Christ, but by some other strange power. Be on your guard, therefore, against such persons.” — (The Epistle of Ignatius to the Trallians, Chapter VI - Abstain from the Poison of Heretics)
Notice the name of this chapter is called “Abstain from the Poison of Heretics.”
Oh how things have changed.
Those who reject the pagan three in one god principle are typically called heretics today, and yet in John's time it was the other way around.
Never underestimate Satan to turn truth into error and error into truth. The Trinity is a creation of Satan via the Catholic Church. Do not be deceived and do not assume as most keep doing.