Well if you & he don't believe that sin even exists, what's the point?<quoted text>
He appears to mean people that say that they were born sinners.
He appears to be saying that the individual decides this about himself. If he declares himself born evil, we take him at his word.
I'm anxious to see how he answers the question himself. It seems to be a tongue-in-cheek way of saying that you can call yourself a born sinner if that's what you think you are, but not anybody else, and that if you do, you should be taken at your word, meaning excluded from positions of authority and responsibility.
None of us like that condescending doctrine, which says that everybody is a sinner, but that since Christians are forgiven, they are cleansed and somehow morally superior. He's turning that around on the Christian.
The bible doesn't dictate that because we are washed of our sins we are morally superior. You're making that up, which is one of the reasons you chose to not believe in God - you make it up as you go.