This is a really interesting take, however I have some doubts...
Not a problem. Honest doubts are a good thing.
1. This would mean 144000 (only men who never had intercourse as per verse 4) had risen from their graves on that day, sound to me like really many for that occasion...
YES, it really
was an astounding number, considering. It was what gave rise to the error being taught by Hymenaeus and Philetus who were saying "
the resurrection is PAST already". So many were resurrected on that day in AD 33 that these two men were mistakenly teaching that this past event was the ONLY bodily resurrection that would ever take place. They were overthrowing the faith of some who despaired that their dead loved ones in Christ had "missed the boat", so to speak. Paul had to correct that error in 1 Thess. 4 and in 1 Cor. 15:22-24, where Paul listed a total of THREE bodily resurrection events which would take place consecutively over time. - first "Christ the First-fruits" (and that 144,000 "First-fruits" group raised in AD 33). "Afterwards" those who were Christ's at His coming (in AD 70), "THEN the END, when He shall have delivered up the kingdom to God..." (in our future).
I wouldn't get too hung up on the "virgin" status of these individuals. After all, since there is "no marriage or giving in marriage" in the bodily-resurrected state, these "virgins" could have been a combination of male and female. Their not having been "defiled by women" I believe was a reference to the woman prophetess in those days named "Jezebel" (Rev. 2:20) who was teaching the servants of God to commit fornication and to eat things offered to idols (called the "doctrine of Balaam"). Both women and men were falling prey to this lascivious doctrine in those days according to the NT epistles, but it did not affect any of the 144,000 glorified Matthew 27:52-53 "First-fruits" who were "sealed" in a perfected state and were therefore immune to this temptation.
2. Did they follow Jesus up into Heaven as per verse 4, there is only mention of Jesus ascending..
You're right - ONLY Jesus ascended to heaven in Acts 1.
No other resurrected person ascended to heaven's temple until the seven plagues were poured out (Rev. 15:8). Those Matt. 27 "First-fruits"
remained on the earth to serve in the early church (as those "gifts to men" in Ephesians 4:8). This is why the 144,000 were the only ones who could "learn that song", because their experience was going to be a unique one.
The 144,000 resurrected Matt. 27 saints were also the "First-fruits" which Paul said the church had in Romans 8:23. These "First-fruits" were also eagerly awaiting the "redemption of the body" for the rest of the dead saints in AD 70, when together with them, they would be caught up in the clouds to meet the Lord in the air. Paul indirectly referred to the 144,000 by calling them those who were "alive" but who had "remained" on the earth (1 Thess. 4). They were "alive" because they had
already been MADE alive in a bodily resurrection process. ONLY bodily resurrected saints were to be "raptured" at that point of Christ's second coming.
3. If they did not ascend into Heaven, then they would be living the rest of their lives with resurected bodies, but how did they then eventually die (because they did)
NO, a second physical death experience is
not even possible for a resurrected person. "
Neither CAN they die anymore, but are equal to the angels..." (Luke 20:35-36) "...It is appointed unto men
ONCE to die, and after that the judgment." (Heb. 9:27)
4. If they rose only with their mortal bodies (lile Lazarus) then they wouldn't be equally resurrected as Jesus was...
Lazarus never died a second time either. Neither did anybody else raised to life in the OT and the NT. That is a common assumption, but that idea of a "double jeopardy" with dying twice contradicts the two scriptures I gave above. Everybody bodily-resurrected in the Scriptures retained that glorified status, just like Christ, "who being raised from the dead DIETH NO MORE; death hath no more dominion over Him" (Rom. 6:9).
5. The "first resurrection" is mentioned as the resurrection right before the millennium starts, do you think we are in the millennium right now?
No, the "First resurrection" ENDED the millennium of Rev. 20. That "remnant
(loipoi) of the dead" which "came to life again" when the millennium was "
finished" and "expired" WAS the "First resurrection" event which was composed of all the "First-fruits". Those "First-fruits" were only a "remnant" of the dead, which numbered 144,000 Jewish OT saints plus Christ. In other words, the raising of the Matthew 27:52-53 saints the same day as Christ arose ENDED the millennium of Rev. 20. It was a
literal thousand years period, extending all the way back to the foundation stone of Solomon's temple being laid down in 968/ 967 BC. One thousand years later in AD 33, Christ became the fulfillment of that symbolism by becoming the "chief cornerstone" of the spiritual temple not made with hands. One thousand years of a God-authorized physical temple system was set aside for the New Covenant realities revealed in Christ.