A landmark 2006 study, analyzing data from a large survey of Americans, found that atheists “are less likely to be accepted, publicly and privately, than any others from a long list of ethnic, religious and other minority groups.”
There is no actual evidence backing up the assumption that atheism somehow leads to a decline in morality. In a 2009 study, sociologist Phil Zuckerman argued that “a strong case could be made that atheists and secular people actually possess a stronger or more ethical sense of social justice than their religious peers,” adding that they, on average, have “lower levels of prejudice, ethnocentrism, racism and homophobia” than the much larger population of believers. He adds that “with the important exception of suicide, states and nations with a preponderance of nonreligious people actually fare better on most indicators of societal health than those without.”
Why Are People Still Afraid of Atheism?
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Always Question Authority 