I'm an atheist. I have been my entire life (even at six, I thought the idea of the world being created by someone in the sky to be absurd). Does that mean that I don't have values? Here's a hint: I do have values.
You don't need a 2,000 year old book to teach someone values, especially one that has values that are out of date, in most cases. Not to mention, what brings one person happiness won't always bring another person happiness. As an example, there are plenty of people who love wrestling and it brings them happiness to watch it. Me? I think it's a load of garbage and is stupid. I prefer such shows as Fringe, Bones, or House. Those same people might just end up feeling the same way towards the shows I enjoy.