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CNN's documentary, "Atheists: Inside the World of Non-Believers," tells the story of a number of people who put themselves in that group -- and the stigma they've faced.

"Stan Bennett" is a minister in a small town, but he no longer believes in God. He's actively searching for other employment so he can leave behind the job he's known for more than 30 years. He knows he's going to come out as an atheist one day, but he's not ready yet. (He is a closeted atheist, so CNN concealed his identity).

Jerry DeWitt knows how Stan feels. DeWitt spent 25 years as a Pentecostal preacher in the evangelical South, but a few years ago he lost his faith. He still preaches, but he now speaks before a congregation of atheists.

David Silverman is the firebrand head of American Atheists, a group formed in the early 1960s that now has more than 5,000 members. He wears his atheist badge with pride, and his "in your face" tactics have made him a legend in the atheist world.

Greg Epstein is the Humanist Chaplain at Harvard University and author of the best-selling book, "Good Without God: What a Billion Nonreligious People Do Believe." He's also the executive director of The Humanist Hub, which connects nonreligious community programs in the Boston area and beyond.

After the documentary aired, CNN asked this group some of the tough follow-up questions about atheism. Their answers have been edited for brevity and clarity. The opinions expressed below are solely those of each speaker.

Bennett: Little by little, we are growing up. It's more difficult for people to stay in their religious cocoons away from the rest of the world. Higher education, travel and the Internet all contribute to our awareness of a bigger world with bigger concepts than the cultural superstitions in which we were raised.

DeWitt: One word: Google. The questions have always been at hand, but now the answers are within our grasp.

Silverman: Religion is factually wrong. As a result, religion lives on ignorance of facts. The reason people are giving up on mythology is the Internet, and the access to information it represents. When religion can exist in a bubble, the lies it pushes cannot be challenged. But when there is a wealth of information at the fingertips of every believer, those lies can be refuted easily, from multiple sources and multiple perspectives. This is why religion is waning, this is why it will continue to wane and this is why it is waning primarily in millennials who are most likely to spend lots of time on the Internet.

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