A study we conducted, led by psychologist Will Gervais, found widespread and extreme moral prejudice against atheists around the world. Across all continents, people assumed that those who committed immoral acts, even extreme ones such as serial murder, were more likely to be atheists.
Although this was the first demonstration of such bias at a global scale, its existence is hardly surprising.
Survey data shows that Americans are less trusting of atheists than of any other social group. For most politicians, going to church is often the best way to garner votes, and coming out as an unbeliever could well be political suicide.