Ancient and Renaissance Christian intellectuals claimed all that was beautiful and humane in pre-Christian Greek and Roman pagan literature was really Christian, inasmuch as the truly brilliant and the genuinely civilized must represent the true religion.
In the twentieth century Christian intellectuals spoke of the anonymous Christian: the non-Christian who by dint of personal excellence was really a Christian, even if his 'anonymity' should extend to refusing every item of Christian belief and practice.
Anyone can perform this maneuver. We could label an especially good Christian an anonymous Hindu, anonymous Buddhist, anonymous Jain, anonymous Muslim. Humanists can do this too. (Humanists are people with a nonreligious usually atheistic attitude toward life who celebrate human ingenuity and goodness.) Humanists can claim all that is good in religion and say it is really Humanist. Humanists can identify excellent Christians or Muslims or Hindus or any other highly talented Religionists and label them anonymous Humanists.
From the Humanist perspective, all religions are the products of human imagination, and that means the best of the religions may be appropriated by Humanists and claimed as their own.
If Religionists ever produced a high fluttering ethical rule, Humanists may assert the rule as their own because, for Humanists, no God ever gave humanity a moral decree. If Religionists ever produced youthful idealism, Humanists may claim the idealism because, for Humanists, feelings of idealism are not produced by religion but by humans. If Religionists ever constructed a beautiful edifice, Humanists may mark the structure as a human product. If Religionists ever produced works of literary merit, Humanists may take those works as their own because nothing other than humans created those works. If Religionists ever made lovely music, Humanists may receive the music as their own.
With the ancient Roman playwright Terence, Humanists may say, 'Nothing human is foreign to me.'
Even with a very limited adoption of select atheists as anonymous believers, Religionists do not typically consider Humanists as part of their religious fold. But Humanists are not at liberty to similarly set Religionists apart, because Religionists cannot be other than part of the human fold. Religionists segregate, Humanists integrate. Religionists exclude, Humanists include. Religionists cannot embrace Humanists, but Humanists can embrace Religionists. Religious creeds have ever parceled up humanity into the tiniest slivers, setting all at odds. A Humanist creed can put all the shards back together again.
Humanists can stop mentally ghettoizing Religionists and start seeing them as undeviatingly part of the human family, even the Humanist family. In a twelve billion year old universe that is close to infinitely vast with its hundred billion galaxies and myriad stars and planets, the likelihood of anyone sharing eight decades of existence with the others who overlap their life is vanishingly small. The people who are alive right now are your people, like them or not. They're your species, your kind, your human kind. It's your and their moment in time. You share oxygenated existence. Look around you and see your Graduating Class: it's a class that includes everyone who is alive at any moment you are alive, from the minute-old infant to the dearly departed century-old Okinawan dying sixty seconds ago.
Humanists need not give up persuasion, argument, and the allegation that a metaphysical mistake has been made on the part of Religionists. But let Humanism be bounded within the largest possible circle, without recourse to Venn diagrams. What does a Humanist have in common with anyone? Answer: his, her, their, humanity. The anonymous Humanist is none other than a named and known human being.