I'm not equating them. On the contrary, I'm saying that both theists and naturalistic atheists should succumb to existential alienation, given the nihilist's point about the inadequacy of either worldview. The issue is the limit of all our models, compared to the inhuman enormity of what likely exists. We're like Salieri from the movie "Amadeus," in that we know we're limited since we're aware there's a much larger whole out there even though we're materially confined to addressing a mundane, terrestrial level of problems.