I came from a family of many Atheists that went back at least three generations before me. I met many other Atheists and all Atheists I met or knew fall into general categories or a combination of these categories:
1) Angry Atheists - those who either consciously or sub-consciously blame God for personal tragedies or human tragedy in general (death, wars, suffering, hunger etc.) which is proof positive to them that there is NO God.
2) Amused Atheists - those who consider themselves 'Enlightened' and transcend other humans who exhibit 'Faith' and consider them simpletons, while considering themselves intellectually and morally superior.