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God doesn't want to "play favorites," and doesn't do this.
Satan does something to prevent God from rapturing the faithful to safety.
Discussed: "So...that's what happens to the faithful?"
Conversed: "Yeah. Or at least the ones God likes".
Not everyone gets into Heaven, either right away or at all. Those who do not ascend to Heaven are left on Earth, and things go downhill from there. Alice and Bob and others who made it are (naturally) concerned about their friends and relatives that (for whatever reason(s)) didn't get taken up with them.
The sudden disappearance of so many members of society leads to rapid economic and social collapse. By the time The Antichrist makes his presence known, he has a hard time uniting even part of the world due to the fact that world conquest is now beyond the means of any single army due to their lack of resources to accomplish such a task.
Except for those few people that are completely irredeemable, those left on Earth repent for their sins, possibly even have a Heel-Faith Turn, and survive Hell on Earth. They are rewarded by being admitted to Heaven to join their family and friends.