In a brilliant and forthright blog (February 1, 2011) by noted atheist biologist P.Z. Meyers, he delivers the following chastisements that no atheist should ignore (especially those loudmouths who keep insisting that atheism is just the lack of belief in God - something I dispute etymologically here - and those who proclaim themselves as "new atheists" who like to promote seemingly clever quips and jabs aimed against theists):
Dictionary Atheists. Boy, I really do hate these guys. You've got a discussion going, talking about why you're an atheist, or what atheism should mean to the community, or some such topic that is dealing with our ideas and society, and some smug wanker comes along and announces that "Atheism means you lack a belief in gods. Nothing more. Quit trying to add meaning to the term." As if atheism can only be some platonic ideal floating in virtual space with no connections to anything else; as if atheists are people who have attained a zen-like ideal, their minds a void, containing nothing but atheism, which itself is nothing. ...
Babies are all atheists or I'm an atheist by default, because I was raised without religion. Nope. Uh-uh. Same problem as the Dictionary Atheist — it implies atheism is simply an intellectual vacuum. Babies aren't Christians or Muslims or Hindus, and they aren't atheists, either, because we expect at least a token amount of thought is given to the subject. If babies are atheists, then so are trees and rocks — which is true by the dictionary definition, but also illustrates how ridiculously useless that definition is. ...
The "I believe in no gods/I lack belief in gods" debate. I have heard this so often, the hair-splitting grammatical distinctions some atheists think so seriously important in defining themselves. All you're doing is defining yourselves as anal retentive freaks, people! Get over it. Either way, you're an atheist ...
Science flies you to the moon. Religion flies you into buildings. The second sentence is false. Religion does not turn you into a terrorist. The overwhelming majority of religious people have similar values to yours; my church-going grandmother would have been just as horrified at people using their faith to justify murdering people as the most hardened atheist, and there have been atheist individuals who also think they are justified in killing people for the cause. So stop saying this! ...
"I just believe in one less god than you do". ... [This] has its own perils. It implies many things that are not true. The theist you're arguing with did not go through a process where he analyzed his beliefs logically, and excluded 99% of all gods by reason and their lack of evidence; in fact, he probably never in his life seriously considered any of those other faiths (he is 99% Dictionary Atheist, in other words). He came to his personal faith by way of a series of personal, positive (to him!) predispositions, not by progressive exclusion of other ideas, and he's simply not going to see the relevance of your argument. Would you be swayed if someone pointed out that you disbelieve astrology, homeopathy, tarot, witchcraft, and palmistry, and he has simply gone one step further than you, and also disbelieves in evolution? ...
And also learn to appreciate that the opposition hasn't arrived at their conclusions in a vacuum. There are actually deeper reasons that they so fervently endorse supernatural authorities, and they aren't always accounted for by stupidity.