You are attempting to apply a structure to this and that is not the same thing as creating answers where none exist. I know that it is the argument that atheism is the absence of belief in gods, but I have yet to see a practical application of that definition. In the absence of information, any position or opinion is a belief. It can't be anything else. The only position of no belief is neutrality. I have yet to meet any proclaimed atheist who was neutral.
Therefore, theism and atheism are essentially the same thinking with different conclusions. Both engage the same process to create answers, the difference is just what answer is created.
We can take your statement as an example: "...Atheism is consistent with the evidence of the natural world..." Precisely what evidence do you base this upon?
Atheism makes no claim to special, magical or supernatural intervention. We remain subject to the same requirements for existence and survival as all other living organisms. We must metabolize, we must consume, we must be born, live our lives, and eventually die. Our biology is a shared one, and our connection with the rest of the natural world is as intimate and complete as that of any other living thing. We have no special dispensation from natural law over other living things, even as we learn to take advantage of our unique understanding of that law.
From this we can infer that mankind holds no special place in "god's plan," that we are neither the purpose nor the paragon of creation. To the extent that we have quantitative abilities that seem superior to those of other species, there are others in which we are markedly inferior. And there is no clear evidence of qualitative abilities unique to humanity.
Conversely, we can also infer that there is no part of creation that takes precedence over mankind because of particular divine preference. All of creation is an inevitable result of the action of natural law, and no part of creation is special in comparison with any other.
Natural laws operate within parameters we generally understand. The results of that operation can redound to either good or ill for humans and humanity, with no obvious preference one way or the other. All outcomes are mixed. Every truth forces a compromise with human interests. There is no natural moral difference between the spring rain that nourishes crops and the drought that kills them. There is no natural moral difference between the bird that lavishes care on its nestlings, and the parasite that eats its living host from the inside out.
It is only through the agent of human choice that a consideration of morals or ethics becomes relevant. There is no moral or ethical component to the outcome of natural law. There is only a moral or ethical component to the outcome of human choice. To the extent that such outcomes are personal and private, the choices are equally personal and private. To the extent that such outcomes are communal, the individual making them is responsible to that community for them. Responsibility and accountability for the eventual "goodness" or "badness" of those outcomes rests squarely with the individual who made the choices.
From this we can infer that god is not a moral agent. The social contracts we adhere to are of human convention, and we are responsible as humans for their rationality, their utility, and their enforcement. God does not care about them.