Come to think of it, you may have something there. The assumption at the heart of neo-paganism - that religion has nothing to do with reality, and everything to do with subjective thins such as emotional fit and/or ethnic belonging - is, to say the least, compatible with a monistic materialist view of existence. And on the other hand, monistic materialism can have no possible exception to "religions" whose sole stated goal is to "heal" the psychic problems of individuals, and that make no claim to having an objective reality.