Apart from perhaps having a more open mind and considering new points of view, I do not think atheism leads to much positive. I am no expert, but if one purposely cuts oneself off from the divine, one loses out on much good (apart from God’s grace.)
More to the point, does a positive good come from atheism? Can one be an atheist and not eventually turn to nihilism and hedonism as philosophies?
Atheism is not a world view, philosophy, contain tenants, leaders, books, creeds, etc. It is a conclusion on a single issue about a single question.
Are you convinced that the supernatural exists? No, nope, nada. Same as a jury that finds, unanimously that the defendant is not guilty. Can you now conclude anything universal about those 12 people other than they were not convinced based on the evidence and arguments put forth? No, No you can not. You can not know their politics, world views, philosophies, etc.
You don’t need a world view to believe that someone presented A + B = Apple as a bad presentation and argument.
Your words here, “…if one purposely cuts oneself off from the divine, …”
Based on that statement, you do not know what an atheist is. Atheists are not making claims about the supernatural at all, only responding to the bad reasons why theists believe in the supernatural. For example: I tell you that I believe that C exists because of the conclusion A + B = C. You don’t believe me. Does that mean that C does not exist or does exist in reality? No, it means that you don’t see that it follows that A + B = C. C could still actually exist or not exist, just that you don’t agree with the argument presented. Did you make a claim about reality because you don’t believe my argument works for concluding that C exists? No, you just find flaws in the argument for justification of that conclusion. That’s all atheists are doing. They are not presenting C as an option because they believe that there is no reason to suggest that C is an option at all at this point. They are not making a claim about C, only about the flaws in the argument leading to justified conclusions about C’s existence. Your belief for the supernatural is an atheist’s response of “We don’t know yet.”.
Your question would be better to discuss philosophies of logical reasoning that people apply that tend to result in people not concluding that the supernatural exists. People use all kinds of reasoning, that works for them, that takes them to the conclusion that the supernatural does not exist.
Next you’d want to discuss why the arbitrary choice of picking a deity for a reference point in morality is any better than someone else’s arbitrary choice for picking their reference point for morality.