A few days ago, on the thread about ?A new view of the Trinity?, RubaDub voiced his disappointment as to the lack of any really new view, such as a fourth member who could turn it into a Quadrinity or replace any of the members of the Trinity in case of emergency. At the moment I just laughed, but later on I thought the Devil could be a very good candidate.
Just think: under the influence of Persian dualism, shortly after Yhwh, the god of ancient Israel, became God in the absolute sense (say in the 6 th century BC, with Second Isaiah), Satan (from a common Hebrew noun meaning ?opposer?) also emerged as a permanent antagonistic figure (in Chronicles, Zechariah, or Job ? and even more obviously in the so-called ?intertestamental literature?).
The new monotheistic deal of early Christianity, which eventually led to the Trinity synthesis in the main Church, did not change much to that. The Satan character, mostly under the Greek adjective/noun diabolos (meaning etymologically ?divider? but more commonly ?slanderer? , and from which the English ?Devil? derives), remained as a ?fourth person? in the metaphysical drama. He was generally thought of as external to God, but not always. Luther, for instance, seems to identify the Devil to ?God?s left hand?.
So my question is: how important is the Devil to God? Or, can monotheism avoid being a practical dualism? Could a really absolute God (such as Second Isaiah meant him to be, saying: ?I form light and create darkness, I make weal and create woe; I the LORD do all these things?), be tenable in the long run?
On this question comments by theists and atheists would be equally welcome. Thanks to all!