It wouldn’t work as a list of Atheist virtues, since there are so many different ways of becoming atheist. Humanist, perhaps. Naturalist, maybe. Rationalist, possibly.
I was proposing a Book of shared positive atheist, humanistic, naturalist and scientific Values, not just reasons to be a non-believer by the logic of rejecting a god.
I believe we all agree on such virtues as “honor thy parents”, “do not steal”, “the golden rule”...etc.
However our coalition could add virtues such as , “First do no harm” (naturalist, medicine), such a mantra is not represented in the bible. Then also, “no god will correct human mistakes, by prayer, thus each is responsible for his/her actions”
Then a list of responsibilities that come with a non-theistic belief, such as “actively promote the welfare of the environment, the oceans, the earth”, etc, with examples of how one may contribute, even in a modest way.
This book could also cite examples where science has contributed to the development of western civilization, where theocratic societies almost always are lagging behind and dwell in the past.
I see as a big problem that atheists and kindred, in addition to disproving the theist’s myths, are not replacing the good and valuable lessons from the bible with a source (book) of positive values which we espouse. The problem as you properly identified is that there is no united front, just a basic reliance on logic and reasoning. But that may not be sufficient. We have to lead in the presentation of beneficial social and natural values. Someone mentioned (correctly) that if you want to replace an established functioning (doubtful) social system with another, it is not sufficient to point to the Constitution and the BOR.
A Book of Human Values put forth by a Free Thinking coalition will allow a theist to shift his/her common values to a more reasoned position in line with non-believers. At least it will go a long way in “humanizing” atheists, etc.
We are NOT the devil!!!!! To convince theists of that is a first order of business.
This would be a major undertaking, but as mentioned, it is required if we are to replace the “holy and sacred books” and societies which are based on these with a functional replacement. Most people seek some guidance in this confusing world.
It will offer a choice between mythology and Objective Reason..