I think it's interesting that when people talk about him, they disparage his faith and his religious views because it's more important to be a gatekeeper than to accept outside of all that he held humanising views of many out groups that Christianity dehumanises.
I don't have an intention of getting too deep into Spong discourse, but many of his modern day critics are more irritated by the fact that he was a Bishop in the church who had his particular theology more than his theological views themselves.