So we (the church) shall all be changed at the last trump, which corresponds only with the first resurrection. This is further confirmed in 1 Thessalonians 4:
Rev 14
3 No one could learn the song except the 144,000 who had been redeemed from the earth.
4 These are those who did not defile themselves with women, for they remained virgins. They follow the Lamb wherever he goes. They were purchased from among mankind and offered as firstfruits to God and the Lamb.
5 No lie was found in their mouths; they are blameless.
Note, it said first fruits just as Paul did.
Romans ch 8
And we know that all things work together for good to them that love God, to them who are the called according to his purpose.that he might be the firstborn among many brethren.
30 Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified.
We can see from the above that Paul knew there were other people who had already been resurrected (Glorified)
John 12
23And Jesus answered them, saying, The hour is come, that the Son of man should be glorified.
Hosea 6
2After two days will he revive us: in the third day he will raise us up, and we shall live in his sight.
There were no Christians in the first resurrection they were Gods chosen from the old testament and were conformed to the image of Jesus.
29 For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren.
All of the verses pointed out here convinces me that Jesus did not go alone but took the 144000 with him.
Mathew 27
51 And, behold, the veil of the temple was rent in twain from the top to the bottom; and the earth did quake, and the rocks rent;
52 And the graves were opened; and many bodies of the saints which slept arose,
53 And came out of the graves after his resurrection, and went into the holy city, and appeared unto many.
Notice, it says after his resurrection, not at his death.
The problem with that interpretation is that the opening of the graves at the time of Jesus’ resurrection was already in the past when the NT writers spoke of the first resurrection as a future event, so they simply cannot be the same event.