Quote:
"If atheism is not religious, surely it's antireligious?"
It is an unfortunate human tendency to label everyone as either "for" or "against," "friend" or "enemy." The truth is not so clear-cut.
Atheism is the position that runs logically counter to theism; in that sense, it can be said to be "antireligion." However, when religious believers speak of atheists being "antireligious" they usually mean that the atheists have some sort of antipathy or hatred towards theists.
This categorization of atheists as hostile towards religion is quite unfair. Atheist attitudes towards theists in fact cover a broad spectrum.
Most atheists take a "live and let live" attitude. Unless questioned, they will not usually mention their atheism, except perhaps to close friends. Of course, this may be in part because atheism is not "socially acceptable" in many countries.
A few atheists are quite antireligious, and may even try to "convert" others when possible. Historically, such antireligious atheists have made little impact on society outside the Eastern Bloc countries.
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Some atheists are quite vocal about their beliefs, but only where they see religion encroaching on matters which are not its business--for example, the government of the USA. Such individuals are usually concerned that church and state should remain separate.