Interestingly, it fit with conjectures Qx had already had. He just thought the two wars would likely be mushed together somehow.
Mercifully, the Bible indicates that "only" roughly half the population of the world to begin with--will be exterminated.
First will be 1/3 dying in roughly the same time. Then later on, another 1/3 of what's left will die. IIRC, that comes out to roughly half.
Whether that life is sentient enough to the point of being more or less advanced is speculation at best. I think it's a sign of a kind of collective human insecurity to always attribute alien life on other planets to be automatically much more advanced then we are. But in any case by all the known laws of physics that we know the notion of life forms traveling here and either being delivering angels come to better us or monsters to wipe us out like so much bacteria is nonsense. The distances from one star system, let alone other galaxies are just too vast. The astrophysics involved make interstellar travel virtually impossible.