Unexceptional? But aren't atheists less moral than religious people?"
That depends. If you define morality as obedience to God, then of course atheists are less moral as they don't obey any God. But usually when one talks of morality, one talks of what is acceptable ("right") and unacceptable ("wrong") behavior within society.
Humans are social animals, and to be maximally successful they must co-operate with each other. This is a good enough reason to discourage most atheists from "anti-social" or "immoral" behavior, purely for the purposes of self-preservation.
Many atheists behave in a "moral" or "compassionate" way simply because they feel a natural tendency to empathize with other humans. So why do they care what happens to others? They don't know, they simply are that way.
Naturally, there are some people who behave "immorally" and try to use atheism to justify their actions. However, there are equally many people who behave "immorally" and then try to use religious beliefs to justify their actions. For example:
"Here is a trustworthy saying that deserves full acceptance: Jesus Christ came into the world to save sinners... But for that very reason, I was shown mercy so that in me... Jesus Christ might display His unlimited patience as an example for those who would believe in him and receive eternal life. Now to the king eternal, immortal, invisible, the only God, be honor and glory forever and ever."
The above quote is from a statement made to the court on February 17th 1992 by Jeffrey Dahmer, the notorious cannibal serial killer of Milwaukee, Wisconsin. It seems that for every atheist mass-murderer, there is a religious mass-murderer. But what of more trivial morality?
A survey conducted by the Roper Organization found that behavior deteriorated after "born again" experiences. While only 4% of respondents said they had driven intoxicated before being "born again," 12% had done so after conversion. Similarly, 5% had used illegal drugs before conversion, 9% after. Two percent admitted to engaging in illicit sex before salvation; 5% after. [
"Freethought Today", September 1991, p. 12.]
So it seems that at best, religion does not have a monopoly on moral behavior.
Of course, a great many people are converted to (and from) Christianity during adolescence and their early twenties. This is also the time at which people begin to drink and become sexually active. It could be that the above figures merely indicate that Christianity has no effect on moral behavior, or insufficient effect to result in an overall fall in immoral behavior.