No, I don't "believe" that. Considering the size of the universe, and the fact the we arose through natural processes, I suspect there is an abundance of life in the universe. However, I don't KNOW that. Until we have evidence, it is an unanswered question.
/// You mentioned best guess. As usual for theists, you have it backward. The question is why is it you can? <>
It seems to have for some half a billion species and some quadrillion living organisms, and that's not counting the species that have gone extinct Ask yourself this: Are there any living species which do not have any meaning in the grander natural scheme?
I don't see God in a pile of bricks so I may not be the most observant person here but I do see faces in the clouds sometimes...is that Big Foot?
There is no inherent meaning other than that which we assign. Are you happy being a chemical process?
Why is it that any sense of spirituality exists in a godless universe? It sprung from a lifeless Universe, right?