Conscience is actually two words. “Con” which means “with”and “science” which means “knowledge”. So, this one word means “with knowledge” and it denotes an entire study of many scientists and other people.

Most people who deny God also want to deny the existence of a conscience because it doesn’t make much sense if we all evolved. How did we get a section of ourselves that can determine between good and bad if we are senseless primordial soup-remakes?

That is the very purpose of the conscience: to alert of us of what is bad and good. If you don’t have a good conscience running then there is something wrong that must be explored.