Listen...!

Question: why do we talk out loud when we know we're alone? Conjecture: because we know we're not. Evolution perfects survival skills. There are perfect hunters. There is perfect defense. Question: why is there no such thing as perfect hiding? Answer: how would you know? Logically, if evolution were to perfect a creature whose primary skill were to hide from view, how could you know it existed? It could be with us every second and we would never know. How would you detect it? Even sense it? Except in those moments when for no clear reason, you choose to speak aloud. What would such a creature want? What would it do?

Hmm. It makes on evolutionary sense, but many talk to themselves only out of loneliness. If there was a perfect hiding place, no one would have found it. Even if a creature is perfect at hiding, that doesn't necessarily mean it'd be hiding all the time. Those are merely the thoughts of a believer, but God isn't an existence we 'know', 'see' or 'touch', it's something we 'believe' in. Why? because #religion

Of course it will. Sound is not something relegated to human perception. That's just physics, and physics don't change just because of the lack of a living organism in the vicinity. Sound travels through air. It's the same reason why there's no sound in space, no air. It's not because we couldn't hear it that it did not happen. But if what you propose really were to happen, it wouldn't pertain to the realm of science anymore. Perhaps something akin to magic. I'd be willing to accept the existence of magic.