Nakedpastor was giving these shirts out in a drawing yesterday. I laughed out loud when I saw it. Truth is often funny because it is true (as Homer says). Hard "A" atheist is probably a little strong for me. I lean more toward the agnostic.
Atheish seems to be the perfect description. It seems to say:
"I am not sure whether a god exists or not... but I am confident yours doesn't exist..." :)