One of the more interesting passages from my aged mind is that presented by Paul:
51Behold! I tell you a mystery. We shall not all sleep, but we shall all be changed,
52in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised imperishable, and we shall be changed.
53For this perishable body must put on the imperishable, and this mortal body must put on immortality.
54When the perishable puts on the imperishable, and the mortal puts on immortality, then shall come to pass the saying that is written...
The sequence is interesting.
When one sees the term "sleep" often one considers that which is dead and buried. However, consider the presentation of "absent from the body, present (to be home) with the Lord."
Then there is the passage that states "...God will bring with him those who have fallen asleep."
Taking then these presentations as factual, the following may be consistent with the timeline presented by Paul.
Those already "present with the Lord" having their eternal form will be brought with him, and we "who are alive" and "persevere" (remain) being preserved by His grace, will be immediately changed into His likeness, and "raptured." The dead already in His presence "imperishable" and those alive changed, not two raptures but a single one effecting only those "changed" the "perishable body" putting on "incorruptible" is the rapture.
There is one such event, and it takes place prior to the millennium reign.
That calls into question the "rapture" that is popularly taught by some who would desire to escape that great tribulation.
I remain unconvinced that such teaching is merited, and have been drawn into the conclusion that the teaching may very well lead to dismay and delusion when it doesn't happen according to how some have presented.
Perhaps ,
"
4They will say, “Where is the promise of his coming? For ever since the fathers fell asleep, all things are continuing as they were from the beginning of creation.”
preceded by,
"
2that you should remember the predictions of the holy prophets and the commandment of the Lord and Savior through your apostles,
3knowing this first of all, that scoffers will come in the last days with scoffing, following their own sinful desires."
is really all part of that time line which Paul also was presenting.
If I do not remain, I shall be with Him at His coming, and to those who do remain, do not let scoffers and mocking dismay and distract from the truth.