I suppose you could add knowing you do good (or at least avoid evil) acts because your want to, not to avoid some future eternal punishment. That you come the “Golden Rule” because you actually believe that to be the best way to live.
Not having to ascent to an organization. While we might all be members of organizations that hold views desperate from our own, but none that I’m member of require me to make myself believe something I do not believe is true.
Also, the OP is an odd question. It presupposes that one might choose a religion (or none) simply for the proclaimed benefits. I think for a lot of us nonbelievers such as myself we simply don’t believe because we didn’t find the whole concept believable.
God is goodness itself. If an atheist believes there is no God, an important contribution, a positive aspect would be to dilineate the nature of goodness and on what it would be grounded.
If goodness is subjective, merely a personal opinion, morality boils down to doing what you want.
Alternatively, if morality exists as an objective reality, different from but as real as matter, to not do good would have consequences.
Pretty much everybody has a sense of karma/justice.
If the Golden Rule is true, and all religions hold it to be so, it points to a goodness which is objectively better than doing the opposite.
If love is just a feeling, you can hold off, if you desire; the sensation will pass.
It isn’t news that the worldly appearance of the church for some, masks the reality of its being the body of Christ.
People say what they think.
But, when we pray or contemplate the word of God, we speak the truth, that our thoughts will follow.
Thereby our understanding, knowledge and wisdom increases.
Unless you pray, contemplate Holy writings and thought, and do good works, you cannot grow the seeds of faith. The weeds of cynicism, doubt, and mundane anxieties, the dryness of the secular world and the lack of spiritual nourishment that comes with giving of ourselves, all will prevent their growth and blosoming.
All religions provide a way to understand the context of our existence; who we are, why we are, what is good and what is bad, they address the sickness that exists within the human condition and offer a cure. Atheism’s answer is that we are a transient part of nature, free to do what we want because what is good is self-expression. With everything of this world ultimately being swallowed by oblivion, YOLO!