Yesterday, I was asked, “What's Judaism's idea of Satan?”
I answered that in Judaism, he's simply another angel. He's a good angel with a dirty job. The proof is that if one looks at the beginning of Job, one sees that the Creator orders him around and sends him on errands.
Then I was asked, whether the presence of such an angel sets up a kind of cosmic duality between good and evil, Zoroastrian style. I responded that in Judaism cosmic duality exists as part of the creation, not as part of the Creator.
Then I was asked whether the presence of angels deliberating in a heavenly court before a soul being judged possibly allude to the presence of multiple forces controlling destiny, a possible multiplicity. I responded that when the Creator deliberates within His Oneness, the various points of view under consideration are experienced on the soul's more fragmented level as angels deliberating in a cosmic court. However, in the ultimate sense, there's only Oneness.