All of these christological, theological, ontological questions, are a distraction. A pursuit of the flesh. It won't save you, it won't sanctify you, it won't do anything for you other than swell your head. Big swollen head/ego. How can I know, with absolute certainty, how Christ exactly relates to YHWH? What's the ontological relationship, EXACTLY, between The Son and The Father? Do you know? I don't. How can anyone know that? We have ideas, opinions, often very strong opinions..That's about it. What you can have, is a personal encounter and relationship with the Living God/YHWH and His Son. You can have the experience of God's presence in your life.
Whoever is actually born again, born from above, knows God is real, Jesus is real, the Holy Spirit is real, the gospel is real, all of these realities aren't figments of the imagination. It's not just someone's personal opinion or sentiment, nor is it a fairy tale. If you're actually a born again, child of God, then you know that the basic beliefs in respect to the biblical God, His Son, Salvation, Resurrection, The Power of God to transform your life, all of that is REAL/REALITY. I may not be able to define exactly how Jesus is One with The Father, or how exactly Jesus is divine, but I do know He's my King and Savior.