I think New Jerusalem is actually going to be a space ship that comes down, takes the 144k up, then torches everyone else. (or something along these lines)
So.. depending on what these aliens look like, I would have different reactions.
My first thought would be, "oh crap, why couldn't I grow a pair and put that 40 day fast in."
But say they looked something totally freaky, like the movies usually depict. Then my thoughts would be like, "hmm b.s., nice one illuminati (

)"
I just don't think anyone else (the other beings) uses bodies that are visible to the human eye, as Earth is the reform school for the beings that cause trouble to the rest of the universe, and flesh suits are a training apparatus for our soul.
So....hypothetically speaking, I probably would end up dead by not giving them any respect, or I'd just lay there thinking, "well, I knew this was coming God, f it, where's that fire pit." (for annihilation of soul and body)