I am really scratching my head on this verse.
John 15:22, “If I [Jesus] had not come and spoken to them, they would not have sin; but now they have no excuse for their sin.”
It seems from the context just before this that the “them” and “they” pronouns refer to “the world.”
What on earth could this mean? If jesus had not “spoken to them” they would not have sin?!
Now I can only think of one place in the text where someone talked to humanity and caused sin... that is Genesis 3, and the agent that spoke to humans and caused “the world” to have sin is the serpent! This would identify Christ with the serpent in Eden?!
This is the NRSV translation and seems to track the greek well. This sense is conserved across to the KJV too.