Rapture...the people that gave their lives to CHRIST, believers in HIM, and look for HIS appearing. The ones that are left behind, are the unbelievers.

The real Christians, those indwelt by the Holy Spirit, will be taken up just before God pours out His wrath upon the world, just after the Sixth Seal and before the Seventh Seal. (Rev. 6:17-------7:17) You have the midpoint of Daniel's 70th week whereby Satan gets kicked out of heaven full of wrath. This goes on for a few years. Then the rapture. Then God pours out His wrath for about 1.5 years. Then Christ returns with His armies.