In this way, Genesis corroborates the idea that the first moment of our new universe was this fundamental differentiation into the two aspects of spirit and matter.
Sorry, Nick, but it corroborates no such thing, for no other reason than it's founded on a metaphysical error.
If God is Absolute, and God is Infinite, then the Absolute and the Infinite cannot be qualified, modified, differentiated or aspected — God cannot become two.
I would suggest there is a reason why verse two: "And the earth was void and empty, and darkness was upon the face of the deep; and the spirit of God moved over the waters" comes
after verse one: "In the beginning God created heaven, and earth"
V1 then indicates we're 'this side' of the creation event, and 'heaven and earth' signifies the primary distinction between the universal (heaven) and individual (earth).
Metaphysically, subsequent to universal/particular come Formless (universal) and Formal (particular) Manifestation. Thus we have "And the earth (particular) was void and empty" because the universal is prior to the individual, and we're still talking
in principle (Hb:
beresith 'beginning') here, the actual cosmos is the work of the second day.
Formless comprises the as yet unmanifested, but also all modes of supraformal manifestation: "and darkness (unmanifested which will in time, God willing, become manifest and thus illuminated) was upon the face of the deep (supraformal)"
Formal Manifestation comprises 'a gross state' and 'a subtle state', the latter being, for example, the extra-corporeal modalities of the human being.
Thus I suggest a more accurate reading of Genesis talks of the modes of manifestation, rather than the modality of God, for in the Christian and the Western Philosophical Tradition, God is One and Simple, not composite, therefore does not manifest in modal fashion.
God bless,
Thomas