The thinkers worth knowing.

Arguably the most brilliant and entertaining critic of religion of his generation. His book God Is Not Great is essential reading — and his debates are unmissable.

One of the Four Horsemen of New Atheism. Harris brings a scientific and philosophical rigor to the question of faith, and isn't afraid to go where the argument leads.

Author of The God Delusion and The Selfish Gene. Dawkins makes the scientific case against religion more clearly than almost anyone — and with remarkable patience.

A former seminary student turned atheist activist. Dillahunty is one of the most skilled live debaters alive — methodical, fair, and relentless.

Included here not as an atheist, but as a case study. His debate with Dawkins and his subsequent conviction offer a sobering look at institutional religion.

One of the Four Horsemen of New Atheism. Dennett brought a philosopher's rigour to the question of why religion exists — and whether we can outgrow it.

Host of Cosmos and author of The Demon-Haunted World. Sagan made the case that science is our best candle in the dark — and that scepticism is a virtue, not a vice.

Known online as Cosmic Skeptic, O'Connor is a young Oxford-trained philosopher making the secular case with clarity, nuance, and genuine intellectual humility.

Peterson occupies a singular position in these debates — not a theist, not an atheist, but a psychologist who argues that religious myths encode genuine truths about the human condition. His five-part debate with Sam Harris is essential viewing.

Born in Somalia, raised Muslim, she fled a forced marriage and eventually renounced Islam — living under death threats ever since. Her memoir Infidel is one of the most important books on religion and women's rights ever written.

The 20th century's most influential atheist philosopher. His 1927 lecture "Why I Am Not a Christian" and the Russell's Teapot analogy laid the intellectual groundwork for modern secular thought.

Best known in these circles for his 2015 RTE interview, where he was asked what he'd say to God: "Bone cancer in children? What's that about?" One of the most articulate voices for secular humanism.

Included here as the most formidable defender of theism. His Kalam Cosmological Argument is the most debated argument for God's existence in academic philosophy. Understanding his case makes the secular response sharper.

Spent 19 years as an evangelical minister and Christian songwriter before losing his faith through his own research. Now co-president of the Freedom From Religion Foundation. His book Godless is one of the most honest deconversion accounts ever written.

Former Saturday Night Live cast member whose one-woman show "Letting Go of God" traces her journey from devout Catholicism to atheism with warmth, humor, and intellectual honesty. Her TED Talk has been watched millions of times.

Creator of "Street Epistemology" — a Socratic dialogue method for challenging faith-based reasoning. His book A Manual for Creating Atheists reframes the goal from winning arguments to changing how people evaluate evidence.

The Amazing Randi was the 20th century's greatest scientific skeptic. A former stage magician, he spent decades exposing faith healers, psychics, and con artists — and offered $1 million to anyone who could demonstrate the supernatural under controlled conditions. Nobody ever claimed it.

Raised in the Westboro Baptist Church — the most reviled hate group in America — she left at 26 after conversations on Twitter slowly cracked her certainty open. Her memoir Unfollow and her TED Talk are essential reading on how minds actually change.

Founded Skeptic magazine and the Skeptics Society, and spent decades as a Scientific American columnist. A former evangelical Christian, his books Why People Believe Weird Things and The Believing Brain explain the psychology of religious conviction better than almost any other source.

Author of A Universe from Nothing, Krauss argues that the laws of physics allow a universe to emerge without a creator — directly challenging the cosmological argument at its core.

Texas-based atheist activist and former state director of American Atheists. His YouTube series "Foundational Falsehoods of Creationism" is the most thorough takedown of creationist arguments available — essential viewing for anyone engaging with biblical literalism.