First, since Ebia said it for me already, I'll quote him:
This, and that, as someone who rejects Gnosticism and Manicheanism as the heresies that they are, I have no interest in any theology that entertains the notion of an evil deity or force. Evil is the absence of good, not a substance or essence in its own. In orthodox Christian theology, such a thing is foreign and condemned (and rightly so).
While it is true that in some Evangelical Protestant (and even moreso in Fundamentalist Protestant) circles there is a sort of semi-Manicheanism, when it comes to true mainstream Christianity that is believed in my the majority of Christians from most Evangelical Protestants to Mainline Protestants to Apostolic Christians, there is no theology of which you describe.
In orthodox theology, God doesn't create evil. It is impossible to create something that doesn't exist. In reality, hatred is the absence of compassion; evil is the absence of good; chaos the absence of order; darkness the absence of light. These are "no-things," not things themselves. When I said the Devil is of hated and evil, that is to say that the Devil is corrupted nature who embraces a perversion of self. After all, the Devil, while a fallen angel, is still of substance; he is still inherently good just like we are, but has chosen to such an extent to live so perversely that he is truly now but a shadow of his former glorious self. That is why the Devil is so ugly in so many of his depictions: to show his true level of self-corruption. The Devil is to be pitied truly more than feared.
My suggestion is to drop +Spong and pick up St. Clive Staples Lewis. I have no argument that Christianity needs to "reinvent" how it teaches of itself in a new world, but that doesn't mean we drop key beliefs like anti-Manicheanism/Gnosticism, the Virgin Birth, the Nicene Creed, and the such. We find new ways to teach those topics, yes, but we don't throw out the baby along with the bathwater.
