TIME — “When you have kids,” says Julie Willey, a design engineer, “you start to notice that your co-workers or friends have church groups to help teach their kids values and to be able to lean on.” So every week, Willey, who was raised Buddhist and says she has never believed in God, and her husband pack their four kids into their blue minivan and head to the Humanist Community Center in Palo Alto, Calif., for atheist Sunday school.

An estimated 14% of Americans profess to have no religion, and among 18-to-25-year-olds, the proportion rises to 20%, according to the Institute for Humanist Studies. The lives of these young people would be much easier, adult nonbelievers say, if they learned at an early age how to respond to the God-fearing majority in the U.S. “It’s important for kids not to look weird,” says Peter Bishop, who leads the preteen class at the Humanist center in Palo Alto. Others say the weekly instruction supports their position that it’s O.K. to not believe in God and gives them a place to reinforce the morals and values they want their children to have.

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