The rapture is new to the Christian scene. It arose in the late 1800’s, when Margaret MacDonald, a fifteen-year-old Scottish girl, claimed to have it revealed to her in a vision. Her vision was then picked up and popularized by the famous British preacher J.N. Darby, during his extensive travels in America.
All love to the high school prom queen and traveling street preacher, but this is a suspiciously short track record for nearly 2000 years of Christian theology.
You must go read all of this right now. And please, whatever you do, do not give money to this monstrosity of a film known by the title of Left Behind.