(1 Corinthians 15:51-53) Look! I tell you a sacred secret: We will not all fall asleep in death, but we will all be changed, 52 in a moment, in the blink of an eye, during the last trumpet. For the trumpet will sound, and the dead will be raised up incorruptible, and we will be changed. 53 For this which is corruptible must put on incorruption,
v 51 - those who are living at "the end" will be changed instantly from a dying to an undying condition as v 53 shows. Paul says nothing about anyone being transported from planet earth. (The meek will inherit the earth and live forever upon it - according the Bible at least! (Psalm 37:9,11,29; Matthew 5:5; Rev. 21:3,4) If some Christians are headed for heaven, then the org must be right about the 2 classes in Christianity.
v 52 - Those in the first resurrection - believers in Christ - will be resurrected on earth in the same undying condition. (1 Cor. 15:23; Rev. 20:4)