1) Non-theism, NOT anti-theism.
2) Not believing in a god, and often, the divine and supernatural in general.
Atheism's followers are called "Atheists"; many ignorant rednecks, however, mistake them for anti-chrisians, satanists, et cetera. Many atheists be that way secretly, to avoid persecution, they are called "closet atheists".
Atheism is bases upon the fact that there is absolutely no solid evidence to show that gods exist. Primitave humans invented gods to explain things they were not advanced enough to explain themselves. Once civiliation was secured, philosophy and science could really start. Parent-to-child indocterination, mostly, has kept religion alive this far.
A word for the western world... They say that atheists single-out chrisitans, never bothering jews, muslums, hindus, etc. Sometimes, that's true in countries where christians are the majority. And when that's the case, they tend to make life hard for minorities. In America, most persecution against atheists comes from christians; so, contempt for christians is developed.
Foolish persons blame the death of over 100 million on the atheism of Stalin and Mao. To assume anyone would base EVERY action on their religion, or lack of one, is uterly irrational. Stalin was paranoid, he killed anyone he had the slightest bad feeling about. His perscution of the orthodox church was not for the sake of atheism, but punishment for supporting the czars. He spared muslums not because of hate for just jews, christians, and such; he was building relationships with middle-eastern countries. Mao killed mostly to conquer the Chinese government and to secure communism's power. Oh, and the holocaust? That was borderline judeophibic anti-semitism, not atheism.
To counter the preveous, think... the crusades, think of witch hunts, of 9/11, gay-bashing, violent jihad, the KKK, the Westboro Baptis Church, the inquisition, jewish segregation, to name a few...
They say atheists have no morals, ethics, values... nothing holding them back. Simply put, that's bullshit. They're no less moral than theists. And truely, you must question the sanity of someone who behaves himself ONLY out of fear of eternal torment.
Roughly 75% of Americans are christians, and at least 10% are atheists.
Now, let's check American prisons...
Roughly 80% of inmates are christians, and less than 0.5% are atheists.
Christian: You're going to hell, atheist!
Atheist: Heh, alright... how about you wait for me to die, come find me in hell, record it on camera, and come back in time to show me some evidece... then, maybe, I'll take you seriously.
It's confusing, how a christian can ridicule atheism, and just feel soooooo sure that there is a god. No egyptian god, norse god, gaillic god, jewish god, greek god, roman god, zoronastrian god, islamic god, or any other god but his specific idea of his ONE, christian god could ever be real, oooh no...
Even IF there are gods, how the fuck could he KNOW he's wasting his life over a real god, or the right god, or if he's actually worshiping him/her/it properly. How does he KNOW this god has some sort of eternal punishment or reward. Has he MET Jesus or Satan!? Has he BEEN to heaven or hell!?
...didn't think so...