Here are some hoopy froods who really know where their towels are:
Joseph Stalin - Stalin was not a model atheist. In fact he was an insane dictator who slaughtered millions on paranoid suspicion alone, and tried to replace the church with his personality cult. But I do enjoy it when certain religious people try to discuss atheism it all turns into "AAAAAGH! STALIN STALIN STALIN STALIN STALIN STALIN!" I mean, if communism is based on so much atheism, no wonder it has a whole lot in common with the early church practices of property sharing as described in the New Testament... Great Boogeyman Stalin cannot be ignored or trivialized, only flung into conversations when it's time to abandon all sense.
Madalyn Murray O'Hair - More commonly known as "Satan," or "The Antichrist." Tried to defect to the USSR, and when that didn't work, she banned prayer in schools. Helped perpetuate a thousand myths that atheism was actually communism and that banning prayer from schools was one step in the Evil Atheist Conspiracy to take God away from everybody. Considering that she was an evil communist with atheist agenda, they're not far off. By the way, her rebellious son became a fundie.
Voltaire - He once that in a couple centuries or so, nobody would read the bible anymore. Not only was he right, but nowadays nobody reads anything else, either. Best known for crushing infamous things, organized religion among them. I could have sworn Catholics still hate the Enlightenment because of Voltaire...