I think of it this way: when the ones in Christ were born from above, God put the spark of the Holy Spirit in their human spirits making them have alive spirits (like Adam had before the fall) within thier human souls; God brings that living portion back to reunited it with a body, to be joined with the ones still alive who have His Spirit in their huamn spirit on Earth, then all those living and living again in Christ are chnaged, in a moment, in the twinkling of an eye and snatached away into the clouds to meet The Lord in the air. What Jesus is taking away from thei planet is His True Church seal with His blood. What is left behind are those who are dead without believing in Him and those alive who refuse to allow Him to be God in them.
This sounds somewhat Mormony to me.