I have never heard an atheist call war on other religions. The majority of atheists tolerate and respect other peoples belief. Those who are religious should look back at the crusades. Thousands of people were killed, raped, mutilated, robed, beaten, etc. All of this in the name of god.
How can you say that they are not peaceful? We don't blow our selves up in the name of Allah. Yes, there are those that go on a rampage but it is their mental state. To answer the question, atheists are more peaceful than religious people.
Are you kidding me? Atheists are just like normal people. Except they don't believe in a superior being. They are not violent or rambunctious in any way. In fact, most atheists believe that religion is the major factor in violence as there is so much disagreement that it leads to violence. Atheists do not hate people, they have their own opinions, much like Christians, and try to educate people on their ideas, in a way similar to Christians without the forceful ways of church, and bible camps and so on. Altogether I don't believe that any being is 'more peaceful' than one another but its fact that Atheists are not 'less peaceful'.
When one believes in something so strongly, in this case religion, they are naturally passionate about their beliefs and rituals. They have a desire to share what they believe and what they have experienced with others, because they want others to experience what they themselves have experienced. Such an act of sharing is actually ministering to others.
If an individual does not have a religious belief that is centered on testifying, ministering and or converting individuals it is easier to remain calm when it comes to matters of religious beliefs. However, it seems although, atheist may not be the most passion about their belief in non religious beliefs, they seem to be the most open to hearing and logically discussing the religious beliefs of those who are passionate about their religious beliefs, as opposed to strong religious believers, who seem to be generally closed minded to hearing any other religious doctrine that they perceive directly conflicts with their own.
Although many religious people would like to think that their belief automatically makes them better than non-believers the truth of the matter is that people run the gamut from peaceful to militant regardless of religious affiliation. There are just as many violent atheists as there are religious people. In the end, we are all people, regardless of beliefs, and there are good and bad apples in every bunch.
It is generally not the religious outlook of a person, but the personality of a person that makes them peaceful or violent. You can find peaceful Christians, and you can find violent Christians. You can find peaceful atheists, and you can find violent atheists. Even if it is possible to establish that one group does tend to be more or less violent, to attempt to use such a broad classification in this way really just misrepresents the classifications.
Anyone who is obsessed with getting other people to believe in their ideals will not be peaceful--atheist or not. Overly religious people who think that everyone else in the world is wrong who doesn't believe like them will not have peace. Similarly, atheists who are determined to convince everyone that there is not God will not be peaceful either. Peace comes from personal security in one's beliefs.