God's judgment operates in two distinct ways: His interventions in present history and His final Judgment at the end of time. While He sometimes brings immediate judgment upon nations and churches in this life, as seen in the Flood and Sodom and Gomorrah, He also has a formal Judgment moment! At the end of the age. Christians will face the Judgment Seat (Bema) of Christ where their works will be tested by fire and non-Christians similarly face final Judgment in the Lake of Fire of the Book of Revelation. Those who reject God's free offer of righteousness given through the Gospel face an eternal judgment, precisely because they have left themselves "in their sins". Christ's forgiveness through Christ's sacrifice offers complete cleansing from all unrighteousness for those who come by faith to Christ, confessing their sins. The severity of both God's judgment and His forgiveness are both the outworking of His perfect righteousness and justice.