It's riddled with myth.
"Atheism is the comprehensive world view of persons who are free from theism and have freed themselves of supernatural beliefs altogether. It is predicated on ancient Greek Materialism."
Largely a myth that the Greeks were "secular rationalists" and thus the forerunners of modern Humanists. Even Greek Materialists held beliefs that were significant supernatural
"Atheism involves the mental attitude that unreservedly accepts the supremacy of reason and aims at establishing a life-style and ethical outlook verifiable by experience and the scientific method, independent of all arbitrary assumptions of authority and creeds."
an ethical outlook verifiable by the scientific method??? A scientistic myth for sure.
"Materialism declares that the cosmos is devoid of immanent conscious purpose; that it is governed by its own inherent, immutable, and impersonal laws; that there is no supernatural interference in human life; that humankind, finding the resources within themselves, can and must create their own destiny. It teaches that we must prize our life on earth and strive always to improve it. It holds that human beings are capable of creating a social system based on reason and justice. Materialism’s ‘faith’ is in humankind and their ability to transform the world culture by their own efforts. This is a commitment that is, in its very essence, life-asserting. It considers the struggle for progress as a moral obligation that is impossible without noble ideas that inspire us to bold, creative works. Materialism holds that our potential for good and more fulfilling cultural development is, for all practical purposes, unlimited."
There is a common humanity that we have moral obligations to? Basically internalised Christianity (certainly hints of Pelagianism in that we are naturally good and can reach earthly salvation through good works, and Gnosticism, knowledge can enable us to transcend our true nature)
Our potential for development and good is "for all practical purposes, unlimited"? For me the science pretty clearly shows we are significantly limited and constrained by our genetics in this regard