Ok, before you guys flame this, know that I spent a lot of time trying to find the information on this and conduct analysis.

I looked at major statistics, statistics on religion and homicide, and religion and suicide. Truthfully I looked at A LOT of statistics (many not shown) and analysis, on both sides of the issue. For the most part though I would say smaller statistics seem to show that homicide ups with religion, and that suicide goes down with religion. If sheer numbers means anything. However, there are debates (very relevant imo) about both, statistically mainly. One key note- major organizations generally don't look into these sorts of things, however, other analysis takes a lot of what major organizations say to make conclusions.
There were a one thing that i was wrong on before that I would like to admit right now ^^
suicide rates to murder rates are about (2.16-10.8)-1, not 6-1.
Most of the studies on suicide rates in the us and and globally are very accurate being that they are Mainly from the US Census, WHO, and Center for Disease Control.The amount varies but in the us is about 10.8-12ish per 100,000 people (and the number of murder per 100,000 people is 1-4) (census).
The number of suicides in the US also has a trend with appearing more often in states with lower rates of religiosity.
Statistics on the relationship between suicide are more obscure though. This is also true with the relationship between murder and religion in countries and especially in developed countries. Why? Because large organizations have done less study on the relationship between religion and suicide and homicide and have focused more on promoting tolerance.
The key "evidence" cited for religion being harmful is done throught the analysis of the appearance of murder in relation to countries and their respective population of religious people. Trends seem to indicate that murder is associated with countries with larger religious populations. These same trends also indicate that countries with larger unreligious populations have higher suicide rates.
Both of these statistics though disregard a lot of important factors though, such as how developed are the countries, the relationship between social conditions and the desire for religion, social pressures,etc...
This can be seen here->
in the following data
(gallup)
most statistics concerning both homicide and religion and suicide and religion though are based off of lesser sources. Its easy to blame say terrorism on religion (even though social conditions, the threat of westernization, economic conditions, revenge from the us military involvement, and the us forced military presence are more probable reason for these).
In countries like vietnam, china, czech republic with large atheist populations their high crime rates seem to go fairly unnoticed though.
However many statisticians in the sources say that economic conditions,
education, unemployment, and diversity is A MUCH BETTER AND CONSISTENT INDICATION of crime levels than religion. And also that political religious movements that cause murder are also decreasing dramatically over time.
let's look at the highest countries with GDP per capita:
Luxembourg $ 68,800
2 Equatorial Guinea $ 50,200
3 United Arab Emirates $ 49,700
4 Norway $ 47,800
5 Ireland $ 43,600
6 United States $ 43,500
7 Andorra $ 38,800
8 Iceland $ 38,100
9 Denmark $ 37,000
10 Austria $ 35,500
11 Canada $ 35,200
12 San Marino $ 34,100
13 Switzerland $ 33,600
14 Japan $ 33,100
15 Australia $ 32,900
16 Finland $ 32,800
17 Belgium $ 31,800
18 Netherlands $ 31,700
19 Sweden $ 31,600
20 Germany $ 31,400
21 United Kingdom $ 31,400
22 Singapore $ 30,900
23 France $ 30,100
24 Monaco $ 30,000
25 Italy
http://www.aneki.com/countries_gdp_per_capita.html
I believe it is much more insynch with rates of murder than the tie between it and religion.
The statistics that show a link between religion and homocide that try to avoid falsely implying that the trends between religiosity and homicide (for which suicide has an inverse rate) are usually smaller based survey groups.
My point is that if you want to believe the crappy statistics out there for religion causing murder, you must also believe the statistics using the same form to show that suicide is prevented in religious areas since they apply many of the same points.
(and not just by country, but also by us state, and over time as well, suicide has been shown to be less in times/places with more religion usually.)
Why is this? Because while you may argue that religion is lax about preventing murder, religions also are very tight on suicide (most relgions have specific rules against it), and most all religions are very against it in their texts, and social groups.
Also, when people are depressed they can seek additional counsel with their religious groups as well to work out the problem (which is less likely with unreligious people). psychologically these social interactions help curb it.
So really, I think what I got out of all of this is that->
both results are basically incomplete, and that if i did believe either I would have to believe both.
As far as the scientist and religion thing goes there are WIDELY differing results and none that are nearly conclusive. the two main ones you'll hear:
BELIEF IN PERSONAL GOD 1914 1933 1998
Personal belief 27.7 15 7.0
Personal disbelief 52.7 68 72.2
Doubt or agnosticism 20.9 17 20.8
BELIEF IN IMMORTALITY 1914 1933 1998
Personal belief 35.2 18 7.9
Personal disbelief 25.4 53 76.7
Doubt or agnosticism 43.7 29 23.3
http://www.freethoughtpedia.com/wiki/Percentage_of_atheists
this one (which is quoted often) has a survey sample of a little over
half of 517 physicists this questionnaire was mailed to. this survey was done by the national association of scientists to its members.
a larger survey with 1646 members on the other hand led by ice University sociologist Elaine Howard Ecklund found that about 2/3 scientists believe in god by questioning lead research university faculty.
http://www.livescience.com/strangenews/050811_scientists_god.html
the most atheist group being biologists and the least atheist group being doctors. physicists and chemists usually fall at around 38% not believing in god. obviously this indicates significant (and unignorable) populations of both thoughts.
result: people have to stop quoting these as fool proof results. seriously :/
Sources: (there are more too...)
these are the main ones imo,
-Census Bureau
http://www.census.gov/
-Census Bureau of Justice
http://www.census.gov/govs/www/cj.html
-World Health Organization
http://www.who.int/en/
-Gallup
http://www.gallup.com/Home.aspx
and then these are smaller citations:
Deaths per 100,000 population: 10.8 (2001)
http://www.suicide.org/suicide-statistics.html
1.3% of all deaths are from suicide
total suicide deaths in the us
32,439 (2004)
"Each year, more than 1million people take their own lives - more than the combined annual deaths from homicides and wars."
http://www.rferl.org/content/article/1071203.html
"According to the latest WHO data (from 2003), the leader of this grim statistic among former Soviet republics is Lithuania, with 75 male and 11 female suicides per 100,000 people. Russia is second (70/12), followed by Belarus (63/10)."
http://www.rferl.org/content/article/1071203.html
http://en.wikipedia.org/wiki/File:Suicides_by_race_hispanic_gender_and_age_1999-2005.png
"An estimated 520,000 people were murdered in 2000 around the globe"
(about two times less globablly)
"Murder rates vary greatly among countries and societies around the world. In the Western world, murder rates in most countries have declined significantly during the 20th century and are now between 1-4 cases per 100,000 people per year."
http://en.wikipedia.org/wiki/Murder
http://www.nationmaster.com/graph/cri_mur-crime-murders
-> the us total murders is 16,204 about two times less.
It is up to even 6 or more times less in other developed countries.
"Religiosity seems to have a protective effect against suicide." "research suggests that in the United States, areas with higher percentages of individuals without religious affiliation have correspondingly higher suicide rates. Involvement with a religion may provide a social support system, a direct way to cope with stressors, a sense of purpose and/or hope, and may lead to a stronger belief that suicide is wrong. Religiosity also seems to be related to other demographic factors; religious North Americans are much less likely than nonreligious people to abuse drugs/alcohol and to divorce (which are both associated with increased suicide risk)."
http://www.mentalhelp.net/poc/view_doc.php?type=doc&id=13737&cn=9
WASHINGTON, D.C. -- Gallup Polls from 2005 and 2006 show that countries that are more religious tend to have lower suicide rates.
http://www.gallup.com/poll/108625/More-Religious-Countries-Lower-Suicide-Rates.aspx
http://media.gallup.com/poll/graphs/080703religiositysuiciderates1_uejdnc83jn.gif
According to a recent study published in The American Journal of Psychiatry religious affiliation is associated with significantly lower levels of suicide compared to religiously unaffiliated people, atheists and agnostics. Source: Kanita Dervic, Maria A. Oquendo, Michael F. Grunebaum, Steve Ellis, Ainsley K. Burke, and J. John Mann. "Religious Affiliation and Suicide Attempt" (161:2303-2308, December 2004).
largest atheist populations:
http://www.adherents.com/largecom/com_atheist.html
(sweden and vietnam lead in percentage) (zuckerman 2005)
(east germany, slovenia, russia, and israel lead in percentage) (Greeley/Jagodzinski 1991)
as you can see in these statistics the largest atheist populations are considered to be
Sweden 8,986,000 46 - 85% 4,133,560 - 7,638,100
Vietnam 82,690,000 81% 66,978,900
Denmark 5,413,000 43 - 80% 2,327,590 - 4,330,400
Norway 4,575,000 31 - 72% 1,418,250 - 3,294,000
Japan 127,333,000 64 - 65% 81,493,120 - 82,766,450
Czech Republic 10,246,100 54 - 61% 5,328,940 - 6,250,121
according to the Zuckerman 2005 survey
and
China 1,298,848,000 8 - 14%* 103,907,840 - 181,838,720
Japan 127,333,000 64 - 65% 81,493,120 - 82,766,450
Russia 143,782,000 24 - 48% 34,507,680 - 69,015,360
Vietnam 82,690,000 81% 66,978,900
Germany 82,425,000 41 - 49% 33,794,250 - 40,388,250
according to the Greeley/Jagodzinski 1991 survey.
"Religion and suicide:
Persons who attend religious services, on average, are generally believed to exhibit much lower rates of suicide. "Those who attend church frequently are four times less likely to commit suicide than those who never attend." 3,7 This affect is seen in various studies which compare church attendance and suicide rates:
Over time: "...fluctuations in church attendance rates in the 1970s paralleled the suicide rates for different subgroups: whites, blacks, men, and women." 4
Among states in the U.S.: with varying attendance at religious services. 5
Among countries worldwide. 6
"In fact, the rate of church attendance predicts the suicide rate better than any other factor (including unemployment, traditionally regarded as the most powerful variable)." 3"
http://www.religioustolerance.org/sui_reli.htm
sources:
William T. Martin, "Religiosity and United States Suicide Rates, 1972-1978," Journal of Clinical Psychology, Vol. 40 (1984), pp. 1166-1169. (Cited in Ref. 3)
Williams, Larson, Buckler, Heckman, and Pyle, "Religion and Psychological Distress in a Community Sample," pp. 1257-1262. (Cited in Ref. 3)
Steven Stack: "The Effects of Religious Commitment on Suicide: A Cross-National Analysis," Journal of Health and Social Behavior, Vol. 24 (1983), pp. 362-374. (Cited in Ref. 3)
Steven Stack, "The Effect of Domestic-Religious Individualism on Suicide, 1954-1978," Journal of Marriage and the Family, Vol. 47 (1985), pp. 431-447. (Cited in Ref. 3)
http://aje.oxfordjournals.org/cgi/content/full/155/5/413
WHO report
top ten countries with the most homicide
(1) Colombia 63
(2) South Africa 51
(3) Jamaica 32
(4) Venezuela 32
(5) Russia 19
(6) Mexico 13
(7) Lithuania 10
(8) Estonia 10
(9) Latvia 10
(10) Belarus 9
the top ten safest (for homicide) countries
COUNTRY
PER MILLION
(1) Slovenia 0.7
(2) Austria 0.9
(3) Sweden 1.8
(4) Switzerland 2.3
(5) Israel 2.3
(6) Hong Kong 2.4
(7) Norway 2.5
(8) Ireland 2.8
(9) Finland 3.7
(10) Singapore 4.3
http://www.benbest.com/lifeext/murder.html
some sites on murder and religion
http://library.thinkquest.org/C0111261/pages/inform_society_religion.php?interlang=englisch
http://moses.creighton.edu/JRS/2006/2006-7.html
http://dailyatheist.blogspot.com/2008/02/homicide-and-religion-linked.html
also this statistic btw on scientist and religion-> one of the most quoted to show that scientists support atheism
BELIEF IN PERSONAL GOD 1914 1933 1998
Personal belief 27.7 15 7.0
Personal disbelief 52.7 68 72.2
Doubt or agnosticism 20.9 17 20.8
BELIEF IN IMMORTALITY 1914 1933 1998
Personal belief 35.2 18 7.9
Personal disbelief 25.4 53 76.7
Doubt or agnosticism 43.7 29 23.3
http://www.freethoughtpedia.com/wiki/Percentage_of_atheists
only has a survey sample of a little over half of 517 physicists this questionnaire was mailed to.
a larger survey with 1646 on the other hand led by ice University sociologist Elaine Howard Ecklund on the other hand found that about 2/3 scientists believe in god.
http://www.livescience.com/strangenews/050811_scientists_god.html
http://www.freethoughtpedia.com/wiki/Percentage_of_atheists
is a very good site though as well.
"What I have done is to show that it is possible for the way the universe began to be determined by the laws of science. In that case, it would not be necessary to appeal to God to decide how the universe began. This doesn't prove that there is no God, only that God is not necessary. [Stephen W. Hawking, Der Spiegel, 1989]"
"I was barked at by numerous dogs who are earning their food guarding ignorance and superstition for the benefit of those who profit from it. Then there are the fanatical atheists whose intolerance is of the same kind as the intolerance of the religious fanatics and comes from the same source. They are like slaves who are still feeling the weight of their chains which they have thrown off after hard struggle. They are creatures who—in their grudge against the traditional "opium of the people"—cannot bear the music of the spheres. The Wonder of nature does not become smaller because one cannot measure it by the standards of human moral and human aims.
— Einstein to an unidentified adressee, Aug.7, 1941. Einstein Archive, reel 54-927, quoted in Jammer, p. 97"