This is quite possibly the most ridiculous and heretical argument that I have ever heard. If people start saying the Bible was wrong about homosexuality, then what comes next? To begin to marginalize sinful actions will open the floodgates to every perverse and immoral behavior imaginable. I have heard the argument that we eventually dismissed Biblical teaching on slavery, but this is not true; scripture acknowledged the existence of slavery, and while it may not have condemned it, it certainly didn't condone it.
This moral relativism is designed to take mankind to the point where people will begin to view the Bible as an outmoded and unrealistic book. The secularists want to totally destroy Judeo-Christian culture and replace it with a modern day Sodom and Gomorrah. Spong is a heretical zealot who has an agenda that is anything but Christian, but what frightens me the most is the fact that he has an audience.
As prophesy states the latter day will be as the days of Noah.