(Ames, Iowa) The sign sits propped on a wooden chair, inviting all comers: “Ask an Atheist.”

Bodnar is the happy face of atheism at Iowa State University. Once a week at this booth at a campus community center, the PhD student who spends most of her time researching the nutritional traits of corn takes questions and occasional abuse while trying to raise the profile of religious skepticism.

“A lot of people on campus either don’t know we exist or are afraid of us or hate us,” says Bodnar, president of the ISU Atheist and Agnostic Society. “People assume we’re rabble-rousing, when we’re one of the gentlest groups on campus.”

As the stigma of atheism has diminished, campus atheists and agnostics are coming out of the closet, fueling a sharp rise in the number of clubs like the 10-year-old group at Iowa State.

Campus affiliates of the Secular Student Alliance, a sort of Godless Campus Crusade for Christ, have multiplied from 80 in 2007 to 100 in 2008 and 174 this fall, providing the atheist movement new training grounds for future leaders. In another sign of growing acceptance, at least three universities, including Harvard, now have humanist chaplains meeting the needs of the not-so-spiritual.

With the growth has come soul-searching – or the atheist equivalent – about what secular campus groups should look like. It’s part of a broader self-examination in the atheist movement triggered by the rise of the so-called “new atheists,” best-selling authors who denigrate religion and blame it for the world’s ills.

Should student atheist groups go it alone or build bridges with Christian groups? Organize political protests or quiet discussion groups? Adopt the militant posture of the new atheists? Or wave and smile?

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As teenagers move into young adulthood, some leave God behind. But not in huge numbers.

More than three-quarters of young adults taking part in the National Study of Youth and Religion profess a belief in God. But almost 7 percent fewer believe in God as young adults (ages 18 to 23) than did as teenagers, according to the study, which is tracking the same group of young people as they mature.

What young adults are less likely to believe in is religion. The number of those who describe themselves as “not religious” nearly doubled, to 27 percent, in young adulthood.

Growing hostility toward religion was found, too. About 1 in 10 young adults are “irreligious” – or actively against religion – after virtually none of them fit that description as teenagers.

At Iowa State, most of the club’s roughly 30 members are “former” somethings, mostly Christians. Many stress that their lives are guided not by anti-religiousness, but belief in science, logic and reason.

“The goal,” said Andrew Severin, a post-doctoral researcher in bioinformatics, “should be to obtain inner peace for yourself and do random acts of kindness for strangers.”

Severin calls himself a “spiritual atheist.” He doesn’t believe in God or the supernatural but thinks experiences like meditation or brushes with nature can produce biochemical reactions that feel spiritual.

When the ISU club began in 1999, it was mostly a discussion group. But it soon became clear that young people who leave organized religion miss something: a sense of community. So the group added movie and board-game nights and, more recently, twice-monthly Sunday brunches to the calendar.

“It’s nice to be around people who aren’t going to bash me for believing in nothing,” said Bricelyn Rector, a freshman from Sioux City who, like others, described community as the club’s greatest asset.

Members also seek to engage their peers at Iowa State, a 28,000-student science and technology school where the student body leans conservative. There’s a “Brews and Views” night at a local coffee house and talks by visiting speakers common to any college campus.

“This is not a group of angry atheists. It’s a group of very exuberant atheists,” said faculty sponsor Hector Avalos, a secular humanist and well-known Biblical scholar who used to be a Pentecostal preacher. “Their primary aim is not to destroy the faith of Christians on campus. It’s more live and let live.”

The “Ask an Atheist” booth is the club’s most visible outreach. On a recent Friday, a handful of members stand ready to intercept students on their way to eat lunch or withdraw money from a nearby ATM.

Traffic is slow. Scott Moseley, a Bettendorf, Iowa, senior, stops for a polite conversation.

He explains that he was raised Methodist, has a Buddhist friend and dates a Wiccan.

“My entire concept of one religion is kind of out the window,” Moseley says.

Bodnar, an ex-Catholic married to a Buddhist, recommends the local Unitarian Universalist congregation, a haven for a grab bag of religious backgrounds and a few members of the ISU Atheist and Agnostic Society.

The closest thing to a confrontation comes when another student, a baseball cap pulled tight to his brow, talks briefly about heaven before he mutters, “I can’t listen to you guys,” and walks away.

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On most college campuses, secular groups take shape when non-believing students arrive and find a couple-dozen Christian groups but no home for them. It isn’t that atheism is necessarily growing among students – surveys show no uptick in the number of atheist and agnostic young adults over the last 20 years.

But the greater willingness to speak out, paired with the diversity within the movement, has resulted is a patchwork of clubs across the country united in disbelief but different in mission.

At Texas State University in San Marcos, a group of freethinkers led by a former Lutheran organizes rock-climbing outings and has co-sponsored a debate with a campus Christian group.

The University of South Florida is home to two active clubs: a freethinkers group that held a back-to-school barbecue and an atheist group that protested an anti-abortion group’s campus visit.

Still other clubs embrace rituals. At the University of Southern Maine, a secular humanist organization has celebrated HumanLight, a secular alternative to Christmas and Hanukkah.

Just in the past year, the Iowa State club has evolved in new directions. Some are things churches have traditionally done – like the club’s first foray into volunteerism, sleeping outside in cardboard boxes to raise money for homeless youth.

Others get at the heart of tensions within the atheist movement. The club worked with a Methodist church on a gay rights candlelight vigil, a gesture that would make some atheists cringe.

“The trouble is, any time you start working with other groups, religion starts coming in,” said Victor Stenger, an adjunct professor of philosophy at the University of Colorado and author of “The New Atheism: Taking a Stand for Science and Reason.”

“People bring up Jesus, they’re trying to proselytize, trying to get people to go to church,” Stenger said. “The atheist groups just can’t put up with it. They have to argue against it.”

More recently, the ISU club’s non-confrontational philosophy has been tested by a debate over the fate of a small chapel at Memorial Union on campus.

The club has avoided taking a position because members are divided. Some want the chapel’s religious symbols – including an eight-foot wooden cross – removed on First Amendment grounds. Others fear repercussions and don’t think a fight is worth it.

“The point of the club is not to make waves or controversy,” said Bodnar, adding that she is uncomfortable with “calling out religion as wrong.”

Some club members would like to be more confrontational when circumstances merit. Junior Brian Gress was interested in participating this fall in a nationwide “Blasphemy Day,” a stick in the eye to religion. But the club passed and the idea fizzled.

“You should always try to make friends, but there are certain things about religion that can’t be tolerated,” Gress said. “Basically, the intolerance of religion can’t be tolerated.”

Most affiliates of the Secular Student Alliance fall somewhere between militant and why-can’t-we-all-just-get-along, said Lyz Liddell, senior campus organizer for the Columbus, Ohio-based group.

“College students can be a little more susceptible to the more reactionary anti-religion voices, partly because it’s so new to them,” she said. “My impression is after a couple of years, they mellow out.”

Christian Smith, director of the Center for the Study of Religion and Society at the University of Notre Dame and a principal investigator on the youth and religion study, said campus atheist groups are better off without militancy. Young adults are taught their entire lives to be nonjudgmental, that different points of views are OK and that there is no one truth, he said.

“Emerging adults are just not into trying to make other people be or do something,” Smith said. “If I were advising atheists and humanists, I would say their long-term prospects are much better if they can successfully create this space where people view them as happy, OK, cooperative, nice people.”

At Iowa State, what one club member describes as a band of misfits and outcasts is trying to carve out a space where atheists who raise a fist and atheists who wave and smile can coexist peacefully.