If your dad's an atheist then he should be able to help quash the tide of evangelism that will come towards you. Also, since your dad is an atheist, it shouldn't start any real trouble at home, which is always a concern when deciding on whether on not to tell people you're an atheist. I say wear the label proudly, and don't worry about how others are going to react.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell
