on the Creator
The demiurge is an expression of philosophy, in that it is a Greek or Hellenistic cultural concept. This means that the Demiurge is a cultural concept from the Greeks who did not believe in the empirical existence of nothingness as non-substantive (ex-nihilo). They treated nothingness as a substance called aether. The Greeks as pagans and pagan philosophers did not believe that you can get nothing from something therefore the creator had to create from "something". Plato it was the good, Aristotle it was energy, Plotinus it was force. These are ontological noema that create consciousness in humans. This arises from the unique essence of Greek or Hellenistic philsophy treating the natural (physic) and supernatural (metaphysic) as extensions of human consciousness. So everything that can be talked about or experienced stems from human consciousness and therefore must be expressed from a anthropomorphic perspective. God or Gods can not be anything outside of human. That's why Zeus and the Gods are flawed as their flaws reflect in man and mankinds flaws reflect in them. The demiurge as a phrase is creator and nothing can be created but in the way that mankind creates. The Greek Orthodox Christian God is not relatiable to the Actus et potentia as the Roman Catholic God since, God in essence is not action or inaction or potential nor inpotential this would make God's being, essence or substance comprehenisible and that then is not the Ortohodox Christian God. The Christian God is not one (the monad) or unity according to St Dionysus the Areopagite.   
Orthodox Christianity did not have the same God therefore the "concept of God" uses and has familiar language (between Hellenstic Greek and Byzantine Greek) but in essence, substance is a different concept of God. In Greek Orthodox Christianity (which Iamblichus kinda tried to graft into Neoplatonism after the fact) God is in and outside the Universe. God is made up of a substance that is beyond substance since God's consciousness ontologically is hyper-being. Meaning that God as a substance can not be detected nor contained. Now this was dependent on the concept of hypostasis, immanence or existence (cataphatic). The Pagan philosophical God was a detectable substance that all things derive from and reduced to. The Orthodox Christian God is a hyper substance that is not empirically detectable. Mankind has to be altered in order to detect it. Since the God in Greek Orthodox Christianity in his trinitarian completeness (uncreatedness) does not have the same consciousness as mankind, did not share mankinds consciousness until he became a human being AKA Jesus Christ. The reverse is only true in Philosophy since in Orthodox Christianity God as a whole has a consciousness which is completely unrelatable to mankind. Philosophy God and mankind have the same consciousness and Roman Catholicism and Protestantism treat God ontologically very much as modalistic (like Sabellianism) which creates also a different consciousness. Orthodox Christianity also rejects this as anthropomorphic-izing the Christian God, which can only come from not actually having experiencing the Christian God (theoria) and only experiencing the template in your brain or intrinsic God of philosophy.