why should your definition of sin have meaning to anyone?

Why shouldn't it? If it's a reserved concept, why is it in this discussion? Is "sin" always defined only from a religious viewpoint? I'll poke fun at pete all I want when he says rude things like the following:

if they think they never do that,it speaks to me of shutting off the sense of wrongdoing and not being able to recognize it anymore.
or
not having any point of reference as a final authority they determine right and wrong on whatever suits them.this admittedly seems consistent with atheism.

Besides, did you really think I was being serious, even though my logic is unassailable from within the Christian framework of reality as expressed in this thread?