After thoroughly condemning the false teachers in chapter 2, Peter now dismantles their arguments. These deceivers scoff that Christ has not returned as promised. We should doubt Christ's return, they say, since the world goes along as it always has and always will. Peter reminds his readers that God is the one who made the world. Noah’s flood is evidence of His willingness to alter the course of nature in order to bring judgment on humanity for sin. Christians should be looking forward to the new heavens and earth, rejecting false teaching, and leading holy lives.
(BibleRef)