From my understanding, they believe Jesus is coming back two times....
Once for the saved Christians and then again at the end of times.
I agree with you...nowhere does the N.T. speak of two returns.
There is a very valid reason why Jesus says that one will be taken and one will be left....
the FORTUNATE one will be left...the one taken will be killed by the Roman Empire.
WHERE THE VULTURES FLY....where the dead bodies are of those killed. (Luke 17:37)
An answer from the other member would have been interesting...but there is no answer.
That verse makes no sense in the pre-trib scenario.
Matthew 24:36-51 no man knows the day or the hour of Christ return, but back tract to vs. 29-31 Jesus gave a great sign to watch for and then will the dead in Christ rise first and we which are still alive at His coming will be gathered up with them in the clouds to meet the Lord in the air on the last day after the seventh trumpet is sounded, Johm 5:28, 29; 6:40; 1 Corinthians 15:51-58; 1 Thessalonians 4:13-18, Rev 19.
Christ coming will be like that of the days of Noah before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noe entered into the ark and knew not until the flood came and took them all away, so shall also the coming of the Son of man be.
Two men in the field two women grinding at the mill represents all who are still alive at the coming of Christ on the last day. One is taken being caught up to Christ with all that are His own as their names are written in the Lamb's book of life. One, represents all those who have rejected God and His Son Christ Jesus. They are the enemies of God as they become the footstool of Christ Jesus when He plants His feet on the Mount of Olives.
Those that have rejected Christ that still remain on earth after the beast, false prophet and all the ruling leaders from every nation that followed after the beast are destroyed are those who are the numbering as the sand of the sea. They are the enemy of God that Satan uses to battle against the saints during the battle of Armageddon that are camped upon the breadth of the earth after he is released for a season, Psalms 2:7-10; 110; Ezekiel 36; 37; Rev 20:7-9.