FWIW, this thread was an Anglican "inheritance" from the old P/R/E forum. I thought it might be interesting to resurrect it for further discussion of Bp. Spong.
The man is highly controversial, and thrives on controversy -- his stance is one that fundamentalism works an injustice on the individual Christian, and hence he combats it with a very personal and highly controverted theology.
First, it's important to note that he is a Tillichian through and through -- much of the theology he does is done in a context that is very easy to misunderstand. For example, he condemns "theism" -- but what he means by it is not the dictionary definition of belief in an active God, but Tillich's specialized use of "theism" to describe belief in a supernatural entity where the Christian God is in some ways similar to Zeus or Brahma -- one entity "with an outside" -- as opposed to the fundamental ground of existence, the loving One who made all and who encompasses all.
And his stance has always been one of Christ and Christians for the outcast, the discriminated against, the rejected and pariah. In this he stands with historical Christian figures and with Christ himself.
However, he is a Dynamist in the sense that term was used to name a heresy in early theology -- Jesus, for Spong, was a man in whom the Christ-power indwelt, and after whose death the Christ-power lived on in the hearts and minds of His followers. This is of course contrary to Nicene-Chalcedonian orthodoxy, even taking the implications of I Corinthians 15 into account.