As far as New Jerusalem is concerned, this means the...

As far as New Jerusalem is concerned, this means the establishment of a new religion replacing Christianity.
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That's close to right. New Jerusalem is ''the Lamb's wife'', the Lamb of course being Jesus. [Revelation21:9-11] So New Jerusalem is made up of 144,000 genuine Christians that are taken to heaven to rule with Jesus over obedient mankind here on earth. This will include the countless millions of both righteous and unrighteous that will be resurrected back here to earth. [Acts 24:15]