When Jesus said judge not lest you be judged, he was referring to the judgment you would bring upon yourself, not a judgment God would visit on you. For God is a God of Love, not judgment, and the Final Judgment will be one where God rejoices that we have returned to Him in our remembrance --- He will "judge" us as His most holy and sinless child. Jesus was referring to the psychological principal of projection. We project what it is we don't like about ourselves in an attempt to "get away" from it. But this is impossible, as ideas/beliefs never leave their source. When we judge someone or something, we are projecting our own self judgment --- the harsher the judgment, the more that person self judges, the more they see evil in the world, the more they see God as a punishing God, etc.