It doesn't say that in the Dictionary, only on Wikipedia, which in terms of accuracy isn't as reliable.
spiritualism |ˈspiri ch oōəˌlizəm|
noun
1 a system of belief or religious practice based on supposed communication with the spirits of the dead, esp. through mediums.
2 Philosophy the doctrine that the spirit exists as distinct from matter, or that spirit is the only reality.
From my computer's dictionary. I don't trust it as much as the heavy Chambers English Dictionary on my bookshelf, but I can't be arsed to get it right now.
According to Wikipedia atheism is compatible with neo-Paganism, Jainism and Buddhism. I don't know what Jainism is
, it's another thing I need to look up. My friend doesn't believe in Christianity, yet she's into Wicca.
A book I found in our shop: The Violence Of God & The War On Terror, by Jeremy Young, who's an Anglican Priest believe it or not. He argues that the image of God encourages violence.