Sounds amusing. Too bad it's based on novels which take the heretical pre-tribulation rapture as a starting point. Check your history--the notion of a pre-tribulation rapture occurs first in the mid 19th century. Patristic commentary on the Scriptural texts evinced to support it make it clear that the uniform understanding of Christians, whether Orthodox, Latin or protestant (and I would dare to venture Coptic, Armenian or Nestorian as well), down to that point, read the texts as describing the experience of Christians alive at the time of the general resurrection, which follows all of the events poetically described in St. John's Apocalyse, being the last event prior to the Last Judgement and the renewal of the world.
Make your own game, then.
Prove that a pre-tribulation rapture (or mid-trib rapture) is heresy. Use the Bible instead of Patristic texts, too.