Why do Americans still dislike atheists?

"A growing body of social science research reveals that atheists, and non-religious people in general, are far from the unsavory beings many assume them to be. On basic questions of morality and human decency — issues such as governmental use of torture, the death penalty, punitive hitting of children, racism, sexism, homophobia, anti-Semitism, environmental degradation or human rights — the irreligious tend to be more ethical than their religious peers, particularly compared with those who describe themselves as very religious.

Consider that at the societal level, murder rates are far lower in secularized nations such as Japan or Sweden than they are in the much more religious United States, which also has a much greater portion of its population in prison. Even within this country, those states with the highest levels of church attendance, such as Louisiana and Mississippi, have significantly higher murder rates than far less religious states such as Vermont and Oregon."

Washington Post, Gregory Paul and Phil Zuckerman, April 30

Is religion good for society? See how God's own country compare.

"Take homicide, which is way higher in the United States than in any other advanced country. Same with incarceration – we have more people in prison than China does, and China is four times our size. In no other first world state do so many die as children. Life spans are notably shorter than in other nations. Abortion rates are higher. Also high are gonorrhea and syphilis infections, which are dozens of times lower in parts of Europe. Out of wedlock teen pregnancy? We’re #1. Divorce? Only the Swedes beat us out. Illicit drug use is exceptionally high. As is mental illness. The U.S.is not a total societal basket case, we are typical in suicide rates and alcohol consumption, and score high on marriage rates and income. But when I tallied up the factors used in my Evolutionary Psychology paper on a zero-10 scale American scored a meager three, while the most atheistic democracies scored up to a remarkable eight (none reached 10, there being no utopias.

[...]

So the line that societies cannot help but go to hell in a handcart if they do not follow the dictates of a God is nothing more than a great big lie. Instead, it is the most atheistic democracies, where few ask what Jesus would do, that enjoy the best overall lifestyle conditions. The same trends hold up within the U.S, too: The Northeast is already as secular as parts of Europe and enjoys less dysfunction than the Southeast which is the most conservative Christian; life spans are actually decreasing in the Bible belt. "

Washington Post, Gregory Paul, 10/17/2011

See the full report here: The Chronic Dependence of Popular Religiosity upon Dysfunctional Psychosociological Conditions

Homicide and religion linked

"In general, higher rates of belief in and worship of a creator correlate with higher rates of homicide, juvenile and early adult mortality, STD infection rates, teen pregnancy, and abortion in the prosperous democracies (Figures 1-9). The most theistic prosperous democracy, the U.S., is exceptional, but not in the manner Franklin predicted. The United States is almost always the most dysfunctional of the developed democracies, sometimes spectacularly so, and almost always scores poorly. The view of the U.S. as a “shining city on the hill” to the rest of the world is falsified when it comes to basic measures of societal health. Youth suicide is an exception to the general trend because there is not a significant relationship between it and religious or secular factors. No democracy is known to have combined strong religiosity and popular denial of evolution with high rates of societal health. Higher rates of non-theism and acceptance of human evolution usually correlate with lower rates of dysfunction, and the least theistic nations are usually the least dysfunctional. None of the strongly secularized, pro-evolution democracies is experiencing high levels of measurable dysfunction. In some cases the highly religious U.S. is an outlier in terms of societal dysfunction from less theistic but otherwise socially comparable secular developed democracies. In other cases, the correlations are strongly graded, sometimes outstandingly so.

Legend: A = Australia, C = Canada, D = Denmark, E = Great Britain, F = France, G = Germany, H = Holland, I = Ireland, J = Japan, L = Switzerland, N = Norway, P = Portugal, R = Austria, S = Spain, T = Italy, U = United States, W = Sweden, Z = New Zealand.

Cross-National Correlations of Quantifiable Societal Health with Popular Religiosity and Secularism in the Prosperous Democracies. Gregory S. Paul, 2005.

Plenty of other figures and text in the article.
See also a new article (1. February 2008) by Gregory S. Paul: Why is Secular European Society Doing so Much Better Than God-Fearing America?