As a number of authors have pointed out, there is good reason to think that evolutionary processes would instill in us a belief in a judge who can see what we do in secret, as a way of motivating our cooperation with one another. But if so, then why isn't belief in such a judge more universal than it is? Why is it possible for us to rid ourselves of that belief?
I don't really mean this as much of a serious argument against naturalistic evolution. But I do want to point out that the problem of divine hiddenness might not be a problem only for theists.