Different resurrections.
John mentions 3 in Revelation, and only the last two are numbered. Figure that puzzle out.
The resurrection Jesus is talking about that has no marriage is this one: Revelation 6:9, "When the Lamb broke the fifth seal, I saw underneath the altar the souls of those who had been put to death for proclaiming the Word of God, that is, for bearing witness."
These souls are in heaven since the resurrection that happened at the moment Jesus died on the Cross. The veil in the temple was rent, bringing an end to the OT covenant. All those saints were resurrected and there souls and bodies (ghosts) are under the alter. Ghost do not marry and have offspring. Next verse 11: "Each of them was given a white robe (new glorified body); and they were told to wait a little longer, until the full number of their fellow-servants should be reached, of their brothers who would be killed, just as they had been." The wait is instantaneous. Verse 12-14:
12 Then I watched as he broke the sixth seal, and there was a great earthquake, the sun turned black as sackcloth worn in mourning, and the full moon became blood-red.
13 The stars fell from heaven to earth just as a fig tree drops its figs when shaken by a strong wind.
14 The sky receded like a scroll being rolled up, and every mountain and island was moved from its place.
This is the moment of Paul's resurrection. The dead in Christ are already under the alter. All receive a robe, and then, those alive in Christ meet them in the air while putting on their white robes in the air.
The first and last resurrection at the end of Revelation consist of this:
1. Those beheaded in Satan's 3.5 year rule.
2. All the dead of all time. Those whose names will be removed from the Lamb's book of life, at the final judgment.
John says that those in the first two resurrections will not be subject to the judgments of the very last resurrection of all dead.
This means any one not under the alter will be subject to the last judgment.
Any one alive on earth, who are not in Christ's retinue in the Second Coming have one last chance to be saved from death. All other humans have already died, and still dead, or they are with Christ when Christ returns.
So those alive on earth will only be saved from death, if they get their heads cut off by Satan. These are the dead of this first resurrection in Revelation 20: "And I saw the souls of those who had been beheaded for testifying about Yeshua and proclaiming the Word of God, also those who had not worshipped the beast or its image and had not received the mark on their foreheads and on their hands. They came to life and ruled with the Messiah for a thousand years.
5 (The rest of the dead did not come to life until the thousand years were over.) This is the first resurrection.
6 Blessed and holy is anyone who has a part in the first resurrection; over him the second death has no power.