Faithlessness and Faithfulness

I am now halfway through a month-long separation from my wife and children, and I find myself thinking about what it means to be "faithful", especially for someone who, as a skeptic, might be described as "faithless".

As an aside, that's one of the things that amused me most about the Universists. They proudly take on a label - "the faithless" - that could easily be construed as pejorative: "those who do not keep faith, and who are thus unworthy of trust."