>>I understood his comments as making a difference between one who "firmly believes that there is no god", and one who "doesn't care one way or the other".
>
>Understood. But as I said, the definition of atheism doesn't include those who "firmly believes that there is no god."
>
>One word I've seen suggested for the belief that there is no god is anti-theism. IMO, anti-theism is as equally impossible to defend as theism is. Any objections to that title?
The prefixes
a, anti, in, im all express more or less the same: a sense of "opposite" or "lack of".
www.dictionary.com defines "atheist" as "One who disbelieves or denies the existence of God or gods". I don't understand this as "not being sure" or "not caring". You will probably want to compare definitions in other dictionaries.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)