The idea that there is such a thing as 'Christian morality' is a myth. People either have the natural capacity for being moral or they don't. What religion does is provide a simplified (and obviously fictional) emotional narrative for a person to give their lives meaning.

Also, people are beginning to confuse morality (our ability to be caring and compassionate) with justice. I think most of the problems with religion is that it distorts notions of justice so as to spread injustices. Barbaric and medieval religions have barbaric and medieval notions of justice, including ideas such as punishment with fear and pain.

As some of the recent comments on this board suggest, many atheists still hold on to medieval notions of justice which contradicts our capacity for moral empathy. This is probably because our notions of justice spring from popular fiction and the news media, rather than from reason.