My parents were very laid back Christians that didn't even preach to others, including me, so when I told them I didn't believe, it wasn't a big deal. They never made go back to church and that was that.
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