The teaching that the Church--in whole or in part--will be caught up to heaven before the reign of the man of sin, the anti-Christ, did not appear in church history until the early part of the 1800's.
Neither any of the early church fathers, neither the early saints like Augustine of the Coptic church and Ephraim of the Syriac church, neither later church writers taught this' doctrine. Neither did the early church creeds of modern times before the 1800's teach this doctrine. On the contrary, when they referred to the last days of the Church, they said that the Church would continue on earth to the end of the reign of the anti-Christ.
http://www.nccg.org/nccm/history-rapture.html
^taken from another christian site...
It's myth just as in other myths...doctrine can be so confusing..all stemming from one myth to another.
Looking at the different denominations views in regard to all the myths dispels the delusion of what being taught today.
Christians don't want to go through a tribulation, so a search and study pulling certain scriptures to fit an ideology happens, infact at the end of the 1st millennium people were selling all they had to send the gospel out and live a certain unselfish life was bigger than it is now at the 2000 ad time....1000 ad was much more aggressive.