Heb_9:28 so Christ was offered once to bear the sins of many. To those who eagerly wait for Him He will appear a second time, apart from sin, for salvation
It's not going to be a secret:
Mat 24:26 "Therefore if they say to you, 'Look, He is in the desert!' do not go out; or 'Look, He is in the inner rooms!' do not believe it.
Mat 24:27 For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be.
It's going to be lightning..you can't mistake it happening.
Mat 24:30 Then the sign of the Son of Man will appear in heaven, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory.
Mat 24:31 And He will send His angels with a great sound of a trumpet, and they will gather together His elect from the four winds, from one end of heaven to the other.
This is the 2nd coming, when those who are Christ's at his coming and those in grave that died in Christ are converted to spirit beings. At the last trumpet, when he takes over earth:
Rev 11:15 Then the seventh angel sounded: And there were loud voices in heaven, saying, "The kingdoms of this world have become the kingdoms of our Lord and of His Christ, and He shall reign forever and ever!"
Christians aren't going to be secretly spirited away, be somewhere for seven years, and then come back.
Amen.