The crux of the current argument appears to be this:
Let us assume, for the sake of argument, that in the beginning there was God. Omnipotent, omniscient, beyond all human weaknesses and failures. He desires nothing, needs nothing.
What motivates him?
The existence of humanity, he says, proves that *something* motivates God to act - otherwise, we wouldn't exist. Adams presents one thing that might be a challenge to such a being: destroying himself. And wondering what would happen if he did.
Humanity, therefore (and by extension the entire universe), is what was left over from God taking on this single challenge, the only thing that could possibly motivate an omnipotent being to act. We are "God's Debris".
Now, from my perspective as a Gnostic and Thelemite, even this is putting way too much anthromorphization on the god-concept. And it still rests on that fundamental idea of a singular omnipotent being, which I heartily disbelieve. But Adams' theory does make the jump to saying that we are all part of the divine, a fundamentally Gnostic idea.