It evolved along with all the other social senses and emotions we have as a means to communicate and interact with each other, and they also tend to maintain clan or group identification.
I will drop the whole evolution debate within this debate, since I currently have no position on evolution.
Of course, the Christian may be less willing to fight and die for virtues and beliefs because they believe that they are "saved", and thus guaranteed a place in heaven.
Being saved is no excuse for being a coward, and I don't know of any specific case of someone becoming more cowardly BECAUSE they were saved.
or because they do not believe they have to do good works towards their fellow man to earn their place in heaven.
There is much said to warn believers of taking this mindset particularly in James. If one does not love and forgive his neighbor he does not love God.
Ah, but yes, I can certinly objectively show you evidence to suggest that a sense of right and wrong are products of evolution.
Yes, that's some very interesting information, but what does it have to do with the relative existence of right and wrong? Even the animals have a sense for it. What's right is right. What's wrong is wrong. You can't get away from it.