Well, there are more versions of the end times stuff than there are churches, it seems, but one view is that after the rapture (Christians teleported away, driverless cars crashing everywhere, etc.), there will be a time of tribulation, during which people will have another chance to be saved. But this time around, it won't be so easy. Persecution, martyrdom, etc. And they won't even have the Holy Spirit to help them! (At least I think I've heard that in one of the versions.)

The CD/8-track/scroll will have all the details you need.

Tim