Maybe Rapture is the future concentration camp where religious crazies and conservative psychopaths are kept away from society. As foretold the Rapture would appear to outsiders as selecting some but not others when in fact it is not a surface reason - it selects for the believers and those parroting them.

With the recidivist and degenerate elements separated from society the people can finally move forward and make life better without taking advantage of a minority. In the case, Heaven could really be the post Rapture period.