Dialogue with a Sincere Seeker about "Trinity"

Sincere Seeker( SS ):
The more we discuss about Trinity God the more Qs( questions) seem to pop up in my head. Here is another one:

Jesus and Holy Spirit seem to exist solely for the human beings.

( { most ( )below are inserted by me with purple fonts}:

( Nope! It is not so.The Trinity exists in all the eternity but the revelation of three Persons in one God is gradually revealed to us. Even Jesus' disciples were fuzzy about the relationship of Trinity God. I don't blame them, Who wouldn't feel fuzzy about the term Trinity? It is not a human invention at all. Not until Jesus was resurrected and when the Holy Spirit brought them into the truth of Trinity God. Without the cleansing of our hearts by the blood of Jesus, the Holy Spirit couldn't dwell in human beings. The Jews who worship only One God, of course couldn't accept Jesus as God. That shows how amazing that 3000 Jewish men, not counting women and children, accepted Jesus as their God in the very beginning of the church history.)

How do you convince yourself that your jg ( Jewish god according to SS )would split into three parts( God didn't split into three parts like an atom, God exists in three Persons in all the eternity.) merely for the purpose of creating human beings,( I've never said that. Where did you get that? Merely for the purpose of creating human beings? Not at all. God the Son revealed Himself fully to become a God man to be born with a virgin birth. So the invisible God had revealed Himself totally visible in Jesus.) which you know well are only about the germs on a sand grain if the universe is the size of a beach. And humans only began to exist on earth one million years ago as in comparison with the universe's age of 13.7 billion years.

Your jg would be too obsessed enough to use two third of himself( it is not 2/3 of Himself. The Trinity is not consisted of 3 parts but of 3 total self sufficient Persons) dedicated to the few germs on a grain of sand. Don't you think?( Dear SS, yes, it is unthinkable and very amazing that our Creator God who created the whole universe would care about our tiny Globe and His created creatures on it, especially human beings. And God is willing to die for us to redeem us back to Him. And God's love is so amazing that He is willing to indwell in Bs(believers).Yet until today you are still rejecting Him and embracing "Nothing creates this universe".

Note:Son of God is using the most intimate term in human relationship to describe the most loving relationship between Jesus and God the Father.)
(The term "Son of God" refers not to procreation, but to a special relationship that Jesus has with God the Father As "the Message" Bible paraphrased to “This is my Son, marked by my love, focus of all my delight.” explained the meaning of " Son" very well.).

p.s. my new insight about Trinity God is one God because their loving relationship is such that they are inseparable. God is Love. Only on the cross that Jesus had separated from His Father because Jesus bore all our sins and God the Father walked away, the rest in eternity the 3 persons are in inseparable loving relationship that they only have one will, one mind and one heart. Perhaps in this light, we may understand why God said there is only One God.