Spong may have been Episcopalian (Anglican in the UK but with some differences) but his writings, sermons and public addresses have many of the US Episcopalian creed seeing him as apostate.As for Bishop John Shelby Spong, he's an Episcopalian, and he is speaking about his church. One I do not have enough knowledge of to comment about their creed, but I do not believe their foundational beliefs are vastly different than most mainstream Christian denominations.
Yes but such becomes a serious issue when supporters of different translations and interpretations of scripture all claim their version is the inerrant 'Word of God’. Unless the Almighty expresses himself/herself etc in riddles and contradictions I suggest all such claims must be taken with more than a grain of salt.But if you really want to have a conversation on diversity, you first need to understand that it applies to much more than religion. It applies to all things. Whereas you may see this as a negative, it is without a doubt a positive and a strength. In fact without it there would be no progress and advancement.