How Are The Dead Raised?

1 Corinthians 15 starts with the gospel, which is inextricably connected to the resurrection (verses 1-4). This was the gospel which was preached immediately upon the arrival of the Holy Spirit, as described in Acts 2. It had never changed, and is exactly the same today as it was when preached by Peter, James, John, Philip, Stephen, and Paul. The end of the first paragraph in 1 Corinthians 15 affirms that the message had not changed:

1 Corinthians 15:11: Whether then it was I or they, so we preach and so you believed.

So we preach and so you believed refers to the gospel in verses 3-4.

Now we move to the final arguments on the certainty of resurrection, and to the nature of the resurrected body you will one day occupy, for eternity. It's a long passage, but we do best to drink it in one gulp so we don't bog down along the way.

1 - the certainty of the resurrection (29-34)
2 - the nature of the resurrection (35-49)