Interesting discussion.
My understanding is that pantheism is different to atheism in a very small way - pantheists may, for example, see 'god' in nature, but not an identifiable 'god' or personal 'god.'
It seems to me that pantheists are not claiming there definitely IS an entity which could be called 'god' and that it had a definite and active role in, say, the origin of life... but that there MAY be some things which we are unable to understand about the universe, and for the purposes of rhetoric, we could attribute such things as the work of 'god' until we know different.
I kinda stopped off at pantheism on my way to atheism, I guess.