Please take a look at Teens Without God, Ask an Atheist. Don't let the "Teens" part turn you off. Many of the questions I answer on this site are relevant to all ages like this one: "Can an atheist still enjoy Christmas?" or "How do I deal with my religious in-laws?" The website is a product of the American Humanist Association. I have answered dozens of questions from people all over the world. Pass it along to parents or teens that you know.