More pop than hymns (consider his audience), but, topically, it seems to fit in this thread, rather than really needing its own: Phil Zuckerman's 65 Greatest Songs for Atheists and Agnostics.

Phil Zuckerman is a professor of sociology at Pitzer College in Claremont, California, and has just succesfully worked to add a new major in "Secular Studies" there.

Of this list of songs, he says

"Strictly speaking, any song that doesn't mention God or gods is an a-theist song. That said, it is still fun to listen to songs that specifically debunk religion, critique faith, express healthy skepticism, laud doubt, celebrate the natural world, advocate humanist principles, uphold reason, declare love, or in one way or another offer a secular orientation that is moral, libratory, valuable, joyous, and vibrant.

"The songs compiled here offer a variety of irreligious, agnostic, secular, naturalistic, or atheist opinions and perspectives, representing a wide continuum: from the harshly damning to the sublimely happy, from literal debunking to mild innuendo. Some of the songs attack Biblical theology head-on, others merely express a natural love of life. Some express a hearty secular sexuality, others comedic blasphemy. Some express defiance, others transcendental acceptance. Some provide existential wonder at the mystery of being, others a sober frankness concerning the brutal facts of life and death. In some songs, critiquing religion is the heart of each verse and chorus, while in others it is merely the soul of a single line or phrase. In some cases, the title of the song alone warranted inclusion. For some songwriters, merely negating religious dogma is the theme, but for others, expressing a respect for human dignity or a deep love of daily life predominates."

Any candidates for the hymnbook here?

~ Becky in Long Beach