The Bible makes a distinction between sin and sins. It is our inner compulsion to follow our own inclinations rather than God's. It is allowing life to revolve around self, or around anything other than God. Sin ultimately results in eternal separation from God. Sins are the specific thoughts, words, and actions that sin produces.
Judgment refers to a courtroom decision.
God convenes His court twice. Not one of their offenses will be counted against them or even remembered. They will be judged, that is, assigned a reward in Heaven, based only on what they've done in obedience to God. But the same Holy Spirit who has communicated to everyone about sin and judgment has also revealed to us the truth, life, and love of God available through His Son.