These things have everything to do with gay marriage. The point is that the Bible is a book that reflects the ideas of its authors, not some divine instruction. And thus arguing against gay marriage because the Bible says it is a sin is to side with a primitive culture which had an unreasonable and barbaric prejudice.

To buttress this point, I note that many of the writers of the Bible had no problems with slavery, polygamy and genocide and did have problems with so many things that seem bizarre today.

And to associate a wholesale change in what constitutes a sin as "administrative differences Jesus introduced as part of his program" is bizarre. What, God rolled out the new Coke? Either eating pork was a sin or it wasn't. Why did God ever care what people ate? Either homosexuality is deserving of death or it isn't.