Is Materialism Inherently Atheistic?

Materialism is the doctrine that claims the ultimate reality is matter, and many people believe that this theory disproves the existence of God. But need a materialist be an atheist, or need an atheist be a materialist? Developments in contemporary science have radically changed our understanding of matter. In this dialogue Mark and Rupert disentangle materialism from atheism, showing that a more sophisticated and contemporary form of materialism could include a spiritual dimension.