ALBANY, N.Y. - When Joe Fox sends his daughters away to summer camp, he's confident they will be surrounded by kids who share his family's beliefs and values. Caitlin, 16, and Elizabeth, 10, go to Camp Quest, which in 1996 created a niche getaway for children who are agnostic, atheist, or just not sure what to believe yet. American parents have plenty of summer-camp options, from Boy Scouts and Girl Scouts to the YMCA, and soccer, dance, music and drama camps. The Camp Quest concept started in 1996 with 20 kids at a site in Ohio with the slogan "Beyond...