Penny Edgell of the University of Minnesota, from back in 2006, found that atheists come in last place when Americans are asked to rank members of certain racial, ethnic, or religious groups as potential spouses for their kids.
psychology professor Adrian Furnham found that people give lower priority to patients with atheist or agnostic views than to Christian patients when asked to rank them on a waiting list to receive a kidney, and legal scholar Eugene Volokh has documented the degree to which atheist
parents have been denied custody rights in the wake of a
divorce.
It is illegal for an atheist to hold public office in seven states; atheists aren’t allowed in the Boy Scouts, the American Legion, or the Veterans of Foreign Wars; Humanist chaplains are barred from serving in our nation’s military; charities regularly reject donations that are offered by secularist organizations.
there is still no question that atheists, agnostics, secularists, and others who eschew religion are widely disliked.
...
That said, we can account for the current level of secularphobia in the US by considering these four factors:
1. Americans equate a lack of
religiosity in general – or atheism specifically – with immorality.
2. Americans equate a lack of religiosity in general – or atheism specifically – with being un-American and/or unpatriotic.
3. There is no stigma concerning the expressed dislike of the non-religious.