Sin is a relative term and as such it means differing things to different individuals but is based solely on the concept of belief in some deity.
I feel sure that had someone asked Hitler if he felt it was a sin to have annihilated 6 million Jews his answer would have been a resounding no. Then if you were to ask Jimmy Carter about having looked lustfully at a woman other than his wife he would tell you that yes he had and that act in itself was a sin.
My own thoughts are that the concept of sin is one used by proponents of religion to hold followers in check in their actions by deeming certain actions as "sins" which of course makes them inherently evil and forbidden.
As one unbound by such concepts or constraints, others ideas of "sin" hold no power over me. I have to ultimately answer to the god of my own destiny that lives within me every day, and as such, hold myself accountable to no one but myself. Though I don't believe in any imaginary friends or a "higher power" the concepts of right and wrong are still deeply ingrained in my thoughts and I have to answer to myself should I violate my own principles in this regard.
So .... if I were to embrace any idea of sin it would only be the violation of my own concepts of right and wrong, but never would that mean I would hold myself accountable to anothers views as others are only gods of THEIR destiny, not mine
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