Yes I agree with you there 1Covenant. I believe the Father is eternal and the Son is eternal. As well as the Holy Spirit being eternal. They are all separate distinct Persons, but they are ONE Being.
I'll give you an example of what I mean.
John 17:11
I will remain in the world no longer, but they are still in the world, and I am coming to you. Holy Father, protect them by the power of your name—the name you gave me—so that they may be one as we are one.
So that they may be ONE as we are ONE. So that they are in perfect unity/agreement, as we are in perfect unity/agreement.
Does Jesus mean so that they may be ONE as in so they may be one single person? Or does Jesus mean let them be ONE as in ONE being but many members. I say members because I am talking about the Body of Christ, One Body but many members.
Rom 12:4 For as we have many members in one body......
So if you believe Jesus is ONE with the Father as in ONE person or member. than you are saying that is how the body of Christ is. Because that is what Jesus is comparing. He is saying SO THAT THEY MAY BE ONE as we are ONE. Where as you and I are both members of the Body, we are ONE body but not ONE member.