(CNN) -
Many Americans are leaving their faith behind. While fewer than 3% consider themselves atheists, about 20% of Americans don't identify with any religion, according to a Pew Study.
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.
Why are Americans losing their faith?
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.
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Atheists open up: What they want you to know
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