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You have at least two subtle assumptions in your questions. I will let you guess what the science oriented ones are, but address an unspoken issue in your post.

The Bible says we humans have a spirit and that we are made 'in God's image'. It may be too much for you to relate to but the beings piloting the craft from another world (not necessary 'not earth of future or another brane') may not have a spirit and in fact may not be created in 'God's image'. That would make we humans a pretty interesting species to observe, albeit we must be very confusing. You might want to consider that 'other beings' may not be capable of 'sin', or may infact have been created so different from us that we are a novelty in a mundane multiverse.