The whole concept of morality seems to be a slippery one. If I were an atheist I would do the most logical thing and jetison it, in favor for an evolutionary sociology aproach. I think that Dawkins has made a good case for this. As I do believe in God I am forced to describe what morality is and how to determine what is moral and what is not. I think that my sense of morality breaks down to intutions and experience.
However, I do believe my sense of morality to be as equally rational as anything else on the market. I don't claim any philisophical advantage over a non-believer. If any non-believer tells me that they believe in morality, I would argue that their systems of thought break down in a similar manner as mine.
"Science without religion is lame; religion without science is blind." - Albert Einstein