There does not seem to be a way to break through the darkness, so explaining the context and audiences to whom Jesus addressed passages found in John 6 will not even be comprehended by those perishing. SR gave the most succinct and on the money explanation when he pointed to John 6:35 as the key to the audiences and the lesson Jesus was giving. The poster tossed aside the clear teaching ion order to ignore truth, so there is no way to reach such an one with reasoned discussion.
Spiritual truths are spiritually discerned and the man without the Spirit cannot understand them.