Grimma, I am not re-writing Christian doctrine here. The Nicene Creed, of 325CE, says 'we believe in...Jesus Christ...being of one sunstance with the Father...who...came down, and was incarnate and was made man.'
So, according to this definition, which became the definition of Christian orthodoxy, Jesus is 'of one substance with the Father.' Whatever the Father is 'made of', Jesus is made of too.
And...this Jesus, the one who is of the same substance as the Father, was made man - during which tme he did not stop being of the 'substance of the Father.' There are streams of thought that say that, eg, Jesus wasn't really a human but only seemed to be so (particularly popular idea in the early centuries), or at the other end of the spectrum, that Jesus was fully human but not God (more popular in the 20th c.)- but these have been rejected consistently by mainstream Christian teaching that says that Jesus is fully God and fully man.
So when I say that the divinity of Jesus can't be tested scientifically, it's the 'substance of the Father' that I'm talking about - because 'God is not an item in any universe.' This is totally mainstream Christian doctrine, not me as some weird crackpot genius revisionist! 
Maybe this is where Dawkins' logic fails at the first hurdle. He says in his preface that 'God is a scientific hypothesis' - but that statement is completely divorced from any historic understanding of God in Christianity, so the hypothesis that God is a scientific hypothesis does not hold water in mainstream historic Christianity. It might hold in certain other religions, I don't know - I'd imagine mainstream Muslims would be horrified by the idea of God as a scientific hypothesis too (although I can't speak for Muslims, obv).
It seems odd and a great shame that, esp as an Oxford man, he didn't make better use of his theology colleagues before launching into his attack on 'religion'. His lack of understanding makes his arguments very weak - I have read on a bit and keep finding myself saying, 'Nooo....you've got it all wrong....that's not what Christians believe....!' He seems unaware of his own suppositions about the type of 'religion' he's attacking, which makes his arguments very unsophisticated, very precocious. He might be a good scientist but he is a terrible theologian!
If I were attempting to write a science book (ha!!!! as if!!!!)
I would certainly want to talk to a few scientists first and make sure I've got my thinking right!