Regarding the doctrine of the Trinity, it’s widely understood by scholars the this doctrine is not found in the New Testament.
“Indeed, until Athanasius began writing, every single theologian, East and West, had postulated some form of Subordinationism. It could, about the year 300, have been described as a fixed part of catholic theology.” (R. P. C. Hansen)
The New Testament itself is far from any doctrine of the Trinity or of a triune God who is three co-equal Persons of One Nature. (William J. Hill, The Three-Personed God (Washington DC: The Catholic University of America Press, 1982), 27.)
There is no formal doctrine of the Trinity in the New Testament writers, if this means an explicit teaching that in one God there are three co-equal divine persons. (Edmund J. Fortman, The Triune God: A Historical Study of the Doctrine of the Trinity (Philadelphia: Westminster Press, 1972), 44
There is in them [the Apostolic Fathers], of course, no trinitarian doctrine and no awareness of a trinitarian problem. (JND Kelly, Early Christian Doctrines, revised edition, (New York: Harper, 1978), 95.)
What does John 17:22 say? And I have given them the glory you gave me, so that they may be one, as we are one
Christ specifically prays that His disciples become one as the Father and Son already are. What type of unity is Jesus hoping for His disciples? Consubstantiality? Or oneness of purpose? I say the latter.
I hope these posts help…
Take care and God bless you.