Theists often ask "Why Do Atheists Care?" If an atheist does not believe in god, why does he/she spend so much time on the subject? This site has the answer:
http://www.abarnett.demon.co.uk/atheism/harm.htmlThe list contains the following (and more)
* The Crusades.
* The Inquisition.
* Witch trials in Europe and America.
* Missionaries destroying/converting smaller, "heathen" religions and cultures.
* The demonization of other religions, e.g. Christianity demonizing Pagans ("They're devil-worshippers!")
* Persecution of Heretics - e.g. Galileo for daring to suggest that the Earth orbits the Sun.
* Children dying because their parents refused them medical treatment on religious grounds
* Slavery, supposedly supported by scripture
* Holy wars - followers of different faiths (or even the same faith) killing each other in the name of their gods.
* The destruction of great works of art considered to be pornographic/blasphemous, and the persecution of the artists.
* Persecution/punishment of blasphemers (Salman Rushdie still has a death sentence on him), and blasphemy laws in general.
* Often-fatal exorcisms by priests believing they are destroying the work of Satan.
* People suffering dreadful injury or death in the belief that their faith has made them invulnerable (e.g. people climbing into lion enclosures at zoos, with a Bible as protection).
* Whole societies divided by minor differences in belief or doctrine, often resulting in violence.
* Mass suicides of cult-members following a charismatic leader who believes the world is about to End
* The attempted genocide of followers of a particular faith
* The practice of "female circumcision" (more accurately termed genital mutilation).
* The discouragement of rational, critical thought (resulting in young-earth creationists, for example).
* Uncontrolled population growth caused (or at least helped) by churches prohibiting birth-control and abortion.
* The spread of sexually transmitted diseases (e.g. AIDS) due to churches prohibiting the use of condoms.
* Believers whipping, impaling, poisoning or crucifying themselves during religious festivals as a demonstration of their faith and piety.
* Suicide bombers taught to believe that martyrs go straight to Paradise.
* Women treated as second-class citizens or even slaves
* Pentecostal snake-handlers
* Persecution of homosexuals
* Abuse of power, authority and trust by religious leaders (for financial gain or sexual abuse of followers and even children).
* Minor religions ("cults") stockpiling weapons to defend themselves from the Armies Of Satan