The rapture IS the catching up and changing from mortal to immortal of believers!

The rapture IS the catching up and changing from mortal to immortal.
Believers Who Have Died and those that are alive on rapture day.

13 Brothers and sisters, we do not want you to be uninformed about those who sleep in death, so that you do not grieve like the rest of mankind, who have no hope. 14 For we believe that Jesus died and rose again, and so we believe that God will bring with Jesus those who have fallen asleep in him. 15 According to the Lord’s word, we tell you that we who are still alive, who are left until the coming of the Lord, will certainly not precede those who have fallen asleep. 16 For the Lord himself will come down from heaven, with a loud command, with the voice of the archangel and with the trumpet call of God, and the dead in Christ will rise first. 17 After that, we who are still alive and are left will be"" caught up""(raptured) together with them in the clouds to meet the Lord in the air. And so we will be with the Lord forever. 18 Therefore encourage one another with these words.
1Thess. 4:13-18
Have you heard Jack Van Impe teach on the pre-trib rapture(catching up of all believers)??http://www.jvim.com/
This weeks on-line TVprogram is powerful!!!