Secularists tend to be more ethical than religious people. On average, they are more commonly opposed to the death penalty, war and discrimination. And they also have fewer objections to foreigners, homosexuals, oral sex and hashish.
The most surprising insight revealed by the new wave of secular research so far is that atheists know more about the God they don't believe in than the believers themselves. This is the conclusion suggested by a 2010 Pew Research Center survey of US citizens. Even when the higher education levels of the unreligious were factored out, they proved to be better informed in matters of faith, followed by Jewish and Mormon believers.