Materialism

is a philosophical theory originating in Ancient Greece. It is often contrasted with Idealism in an attempt to define itself. The main argument of this philosophy is that everything in the Universe is made of some form of matter. It tends to reject any spiritual or religious ideas, instead opting to explain them in materialistic terms.

Compare

 * Idealism (The philosophy of non-materialists)
 * Spirituality (A pop philosophy which rejects )