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In case you want to know who the 50 (there's a few more actually) voices are, here's a list of contributors: Here's a complete list of contributors and essays:
Unbelievable! — Russell Blackford; My “Bye Bull” Story — Margaret Downey; How benevolent is God? – An argument from suffering to atheism — Nicholas Everitt; A Deal-breaker — Ophelia Benson; Why Am I a Nonbeliever? – I Wonder... — J. L. Schellenberg; Wicked or Dead? Reflections on the moral character and existential status of God — John Harris; Religious Belief and Self-Deception — Adèle Mercier; The Coming of Disbelief — J.J.C. Smart; What I Believe —Graham Oppy; Too Good to Be True, Too Obscure to Explain: The Cognitive Shortcomings of Belief in God — Thomas W. Clark; How to Think About God: Theism, Atheism, and Science — Michael Shermer; A Magician Looks at Religion — James Randi; Confessions of a Kindergarten Leper — Emma Tom; Beyond Disbelief — Philip Kitcher; An ambivalent nonbelief — Taner Edis; Why Not? — Sean M. Carroll; Godless Cosmology — Victor J. Stenger; Unanswered Prayers — Christine Overall; Beyond Faith and Opinion — Damien Broderick; Could it be pretty obvious there’s no God? — Stephen Law; Atheist, obviously — Julian Baggini; Why I am Not a Believer — A.C. Grayling; Evil and Me — Gregory Benford; Who’s Unhappy? — Lori Lipman Brown; Reasons to be Faithless — Sheila A.M. McLean; Three Stages of Disbelief — Julian Savulescu; Born Again, Briefly — Greg Egan; Cold Comfort — Ross Upshur; The Accidental Exorcist — Austin Dacey; Atheist Out of the Foxhole — Joe Haldeman; The Unconditional Love of Reality — Dale McGowan; Antinomies — Jack Dann; Giving up ghosts and gods — Susan Blackmore; Some thoughts on why I am an atheist — Tamas Pataki; No Gods, Please! — Laura Purdy; Welcome Me Back to the World of the Thinking — Kelly O'Connor; Kicking Religion Goodbye … — Peter Adegoke; On credenda — Miguel Kottow; “Not even start to ignore those questions!” A voice of disbelief in a different key — Frieder Otto Wolf; Imagine No Religion — Edgar Dahl; Humanism as Religion: An Indian Alternative — Sumitra Padmanabhan; Why I am NOT a theist — Prabir Ghosh; When the Hezbollah came to my school — Maryam Namazie; Evolutionary Noise, not Signal from Above — Athena Andreadis; Gods Inside — Michael R. Rose and John P. Phelan; Why Morality Doesn’t Need Religion — Peter Singer and Marc Hauser; Doctor Who and the Legacy of Rationalism — Sean Williams; My non-religious life: A journey from superstition to rationalism — Peter Tatchell; Helping People to Think Critically About Their Religious Beliefs — Michael Tooley; Human Self-Determination, Biomedical Progress, and God — Udo Schuklenk.