You are welcome to disagree.
then I shall.
In Christianity Jesus is a manifestation of G!d, hear on earth...G!d's son? Or G!d on earth in the triune?
Both. He is instrumental in revealing both.
Paul asked us to put the mind of Christ in our mind.
Indeed he did. The point being
His mind is not my mind, your mind, or anyone else's mind.
By his own words, Paul does not see Christ as some abstract divine entity, He sees
a divine person. The turning point of his whole realisation, however one sees it, whether revelation, inspiration, or a psychological breakthrough, is that Jesus Christ is a person, who says "Saul, Saul, why persecutest thou me? ... I am Jesus (that is the founder of the cult the Christians practiced) whom thou persecutest." (Acts 9:4,5).
His conclusion, after many years of reflection, was that Jesus Christ, the heresiarch Jew who's followers he persecuted, was man, and God. Not an easy thing to come to terms with, if for nothing else than he must admit 'a strange god' (cf Deuteronomy 5:7) and, if he's wrong, he's broken the first two commandments of the decalogue in no uncertain manner.
Jesus said whatever he could do we could do...
Only because He makes it possible for us to do it: "I am the vine: you the branches: he that abideth in me, and I in him, the same beareth much fruit: for without me you can do nothing." (John 15:5).
This, notably, is an outright claim to divinity, by the way. He's talking of Himself, not of God, and if He is not God, then He is a blasphemer, for He is claiming to be the source of Life itself.
...brothers and sisters...
"For whosoever shall do the will of my Father, that is in heaven, he is my brother, and sister, and mother," (Matthew 12:50, Mark 3:35). Kin in the sense that they serve the same God, not kin by nature nor by birthright: "You are from beneath, I am from above. You are of this world, I am not of this world" (John 8:23).
... sons and daughters ...
Ditto.
we all have that spark of divinity within...
Hmm, the 'divine spark' is a non-Biblical notion though, isn't it, a dualist way of seeing that's refuted by Abrahamic holism. The divine breathe animates, but does not part divinity, to Adam, he becomes a living soul, not a God (Genesis 2:7).
God is an Immanent Presence to the soul, but it is not the
substance or
nature of the soul as such. How can it be? How can anything be inherently divine and
not know, when we declare that in the divine is One without condition, determination, limitation, imposition?