In 2 Peter 3, Peter says that his audience had escaped the corruption that is in the world and taken on the divine nature according to the promises of God. He also says, in verse 11, that they would have a glorious entrance into the kigndom of God.


This glorious entrance and transformation from corruption to the divine nature is precisely what Paul is discussing in 1 Corinthians 15. It is a transformation, not of body to spirit, but of the fleshly world to the heavenly world in Christ.