Jesus is God in that the Fathers fullness dwells in Him. That fullness or the Father has no beginning in scripture. The Son (who we now know as Jesus) has a beginning. The firstborn of all creation. Father=>Son=>angels=>the creation (All the aspects listed in Genesis)
So the Father is in the Son and the Son is in the Father. In that manner they are One. Jesus the Son has His own spirit. In that manner He is not God. (a son) There is only One Holy Spirit or Spirit of the Soverign Lord. (The Fathers being) But a Jesus apart from the fullness has never existed so as I state I need not consider the quality of the Son apart from that fulness. The Father is in the Son. The Father is Jesus's God and our God.
In the name of the Father, SON, Holy Spirit.
This question about the 'fulness' of God interested me and I looked it up. This is what I found:
It means a patch on a garment:
Matthew 9:16 No man putteth a piece of new cloth unto an old garment, for that which is put in to fill it up <4138 = fulness> taketh from the garment, and the rent is made worse.
It means when something is filled to the brim:
Mark 8:20 And when the seven among four thousand, how many baskets full <4138> of fragments took ye up? And they said, Seven.
The Jews will have a certain 'fulness':
Romans 11:12 Now if the fall of them be the riches of the world, and the diminishing of them the riches of the Gentiles; how much more their fulness <4138>?
So will (or do) the Gentiles:
Romans 11:25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness <4138> of the Gentiles be come in.
The earth has a certain fulness:
1 Corinthians 10:26 For the earth is the Lord’s, and the fulness <4138> thereof.
There is a fulness of time:
Galatians 4:4 But when the fulness <4138> of the time was come, God sent forth his Son, made of a woman, made under the law,
The church is the fulness of Christ:
23 Which is his body, the fulness of him that filleth all in all.
We will be filled with the fulness of God:
Ephesians 3:19 And to know the love of Christ, which passeth knowledge,
that ye might be filled with all the fulness <4138> of God.
So it simply means that the richness, the overflowing, the superabundance which God has, has been given to Christ, and most importantly in the context of this discussion,
will be given to us.
That, of course, does not and will not make us members of the trinity! Equally, it does not make Christ a member of the trinity.
Colossians 1:19 For it pleased the Father that in him should all fulness <4138> dwell;
Colossians 2:9 For in him dwelleth all the fulness <4138> of the Godhead bodily.
As someone pointed out above, Godhead is a terrible mistranslation. It sounds as if it's an ordinary noun, but in reality it is an abstract noun, and describes a quality, rather than a thing. Divinity, and not the divine.