And my answer to that, from what I believe was probably Epicurus' perspective, is that many people would conclude (if they believed that this earth was the only inhabited place in the universe) that that would mean there is something "special" about us, leading directly to a likely conclusion of divine action to explain that "specialness".
I see what you say but I still think that you can get to that conclusion from the materialism and naturalism of the Philosophy; I don't need isonomia for that. I would even go as far as saying that there being other places where life like outs exist doesn't automatically discard the possibility of a supernatural intervention, these supernatural gods could've very well decided to create others "as special as we are".