Atheism cannot be productive?

The projection for when the big freeze is to occur is so far away that the likelihood would be that there would be no human species as it would have evolved in so many ways as to make it nonhuman. I don't really understand how the region of space we inhabit that was created by the big bang (so often mistaken for the "universe". The universe describes the entirety of existing things. The region of space that makes up our observable "universe" is very likely not unique. I can't see how a creature who's the ability to go faster than the speed of light can't go somewhere that they can live. Maybe not. Maybe several billion years isn't enough time to figure that out.