You misunderstood me in some of this post. But this is sprawling a bit and I see no urgent need to correct the little things. The one point I think you miss, is that yes, "that they may be one as We are One" is the point.
But we are not like Christ, are not one with the Father like Christ, we are one with the Father THROUGH Christ. That is the difference. The nit we seem to get hung up on eternally you and I.
I may become one with the Father as Christ is one with the Father,
but I am not one with the Father by the same method that Christ is one with the Father.
He has always been one with the Father. He is the Vine. He is the One and Only, in whom the Father is well pleased, because he ALWAYS does what is pleasing to the Father.
I am one with the Father through my Lord Jesus Christ. Only. No other way. I do not always do what is pleasing to the Father...
It is my faith in his Son that reconciles me to Him.