:: Absolutely not. 'conscience,' like 'morality' is a social construct.
Barry, in all honesty, don't you have to disprove the existence of God and therefore any moral standard He may have endowed us with to claim the above as an axiom? These statments, and others like them, made by you are predicated on belief, no? You believe there is no God - right?
You certainly can't prove that.
Morality is only a social construct if there is no higher ideal imposed upon us by a higher source. Thus, morality loses any imperative when the language of absolutes becomes inappropriate. There is no real right and wrong when what is considered right and wrong change according to the whims of man and the passage of time.
If man's perception of right and wrong is continually evolving, how can you or anyone else have any intellectual integrity when using the language of moral absolutes? To attempt to emotionally persuade folks with moral absolutes is foolishness if you are merely a man with an opinion.