"we don't/can't know if there is a god or not" is agnostic.
"there probably isn't a god" is atheist - there might possibly be a god, but there's no evidence for it.
(, Tue 20 Jan 2009, 12:06, Reply)
unicorns, fairies, wookies, whatever. If I came and told you that I had a unicorn grazing at the end of my garden you'd call me mad. And quite rightly so.
(, Tue 20 Jan 2009, 19:41, Reply)