There's one big problem with that, among many.
None of us were divinely conceived. None of us have God Almighty, the Spirit (John 4:24), as our contributing Father's seed to our earthly mother's egg.
All of us have a physical human father and mother.
That changes the dynamic tremendously.
It changes nothing really. A father is
never his own son nor a son his own father. If the Father and Son are the same person, then God's revealing himself to us as Father and Son it completely meaningless and communicates nothing to us, which is to defeat the whole purpose of him communicating to us about himself.
Joh 17:3
And this is eternal life, that they know you, the only true God, and Jesus Christ whom you have sent.
Joh 17:4 I glorified you on earth, having accomplished the work that you gave me to do.
Joh 17:5 And now,
Father, glorify me in your own presence with the glory that I had with you before the world existed.
...
Joh 17:21 that they may all be one, just as
you, Father, are in me, and I in you, that they also may be
in us, so that the world may believe that
you have
sent me.
Joh 17:22 The glory that you have given me I have given to them,
that they may be one even as we are one,
Joh 17:23
I in them and you in me, that they may become perfectly one, so that the world may know that
you sent me and loved them even as you loved me.
Joh 17:24 Father, I desire that they also, whom you have given me, may be with me where I am, to see my glory that you have given me because
you loved me before the foundation of the world.
Joh 17:25 O righteous Father, even though the world does not know you,
I know you, and these know that you have sent me.
Joh 17:26 I made known to them your name, and I will continue to make it known, that
the love with which you have loved me may be in them, and I in them.” (ESV)
Everything about these verses, all the language used, speaks of plurality and distinctness between the Father and the Son. The Father is in the Son and the Son in the Father
so that "they may also be in us." Why? "So that the world may believe that you have sent me."
As I have repeatedly pointed out, the Father
sent the Son. Jesus repeats this several times in this chapter alone and it is repeated throughout the NT. That speaks of distinctness prior to the birth of Jesus. And just in case that isn't clear enough, Jesus supports that idea by claiming to have existed (as the Son) prior to creation, in both verse 5 and 24. These point directly back to John 1:1.
We also see, as I have pointed out more than once before, that the Father loved the Son,
even before creation. This fully supports what John says twice in 1 John 4, that "God is love." That is, it is intrinsic to the nature of God. He cannot not love. What then is love? At its fullest, it is
both a healthy love of self
and an outward expression towards others. We should fully expect then, that if God
is love, that his love
must have the fullest expression and necessarily includes love of others from before creation of all time and space, from eternity past.
However, if God is a monad (Islam, Arianism, Modalism, Oneness), then to say that “God is love” means 1) that God loved himself, and 2) that the fullest and proper expression of his love is dependent on creation. This contradicts the statement that “God is love,” as it leaves His love incomplete and deficient, meaning that he cannot be truly and fully God.
When we consider the Trinity, however, it all works. There are three persons each truly and fully God, equally possessing the full and undivided essence (one being that is God), having been in and intimate and loving relationship and communion for eternity past. Only now we can truly say that God is love. Diversity within the unity.