If. Then.

2 Peter 2:4-9 For if God did not spare angels when they sinned, but sent them to hell, putting them into gloomy dungeons to be held for judgment; 5 if he did not spare the ancient world when he brought the flood on its ungodly people, but protected Noah, a preacher of righteousness, and seven others; 6 if he condemned the cities of Sodom and Gomorrah by burning them to ashes, and made them an example of what is going to happen to the ungodly; 7 and if he rescued Lot, a righteous man, who was distressed by the filthy lives of lawless men 8 (for that righteous man, living among them day after day, was tormented in his righteous soul by the lawless deeds he saw and heard) – 9 if this is so, then the Lord knows how to rescue godly men from trials and to hold the unrighteous for the day of judgment, while continuing their punishment. 
 
IF God is holy, then he will judge evil. If God is holy, then he will save the righteous.
   Sometimes it is very difficult, almost impossible to believe God will condemn sinners to hell. This is especially true when we think of people who seem to be essentially good people, but they refuse to believe in Jesus and God’s Holy Word. But in this very long sentence, Peter declares to the church that God has condemned rebellious angels and unrepentant people into the gloomy dungeons to be held for judgment.
   His reference to the angels’ sin is their corruption before the Fall. Satan and his followers were glorious angels in heaven until Satan rebelled and other angels followed him. (Jude 6) Ultimately, all will be finally judged at Jesus’ return as Jesus promised in Matthew 23:32-33 and in Revelation 21:8.
   God will save the righteous. Peter reminds the Jews and teaches the Gentiles that God saved the righteous Noah from the Flood’s condemnation. He saved Lot from Sodom’s and Gomorrah’s fiery destruction. God has judged with a flood. He has judged with fire and brimstone. God has judged the righteous to be saved and the sinner to be condemned.  
          We know what God will do because we know what God has done. If people sin and do not repent, then he judges them into hell. If people repent and call on the name of the Lord for all righteousness, then he saves them into heaven. This is what God has done. This is what he will do.