What you fail to understand is that the Lord dealt with all sin on the Cross. That's why He said what He did here, and you refuse to believe Him. He explained that when He had "departed", the Comforter (Holy Spirit) would come and reprove the world of "sin"....because they believe not on Him. He knew He would die for the sins of the world and the only thing man needed reproof for was for not "believing".
John 16:7-9 Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you. And when he is come, he will reprove the world of sin, and of righteousness, and of judgment: Of sin, because they believe not on me;
So, as STP told you, it's unbelief that separates us from God because Christ dealt with all sin (except unbelief) on the Cross.
Our Lord knew there would be some that just didn't get it....like the apostles and YOU. We keep trying to explain, but you're stuck in the mud of unbelief. :nono:
John 16:12-13 I have yet many things to say unto you, but ye cannot bear them now. Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.