I'm not so sure if Abraham was so much strongly monotheist as he was henotheist; certainly, until very late Israel and Judah were henotheistic, not monotheistic; that is, they believed multiple gods existed, but only worshipped the one. And from what I recall, the dualism of God/the Devil is mostly a Christian thing, when they slapped pagan theology onto Jewish holy texts. And isn't the Demiurge out of Greek philosophy? As to "the Holy Spirit" calming YHWH, that presupposes two things: first, that YHWH spends a lot of time angry and needing to be propitiated, which is much more of a Christian assumption than a Jewish one, I believe. It's part of what happens when you separate God into three pieces and one of them (Jesus) is explicitly all about forgiving; then one of the others needs to be seen as angrier to compensate, and once Christians had decided Jews were Evol it was a good "justification" for prejudice--not only were Jews Christ-killers, they worshipped the angry god of the Old Testament! The other thing about the Holy Spirit calming YHWH is that the Holy Spirit being separate from the Father/Creator is also a product of Christianity; in the Hebrew Bible, the spirit is "ruach elohim," "the breath of God." It's not separate from the Creator, it's a part of the Creator that gets sent out into the world.