Sentence:  Every object, animate or inanimate, every idea, abstract or concrete, became endowed with a spirit of its own. The religion of Rome was a <WSD>pandaemonism</WSD>, a belief, not in one god, pervading all nature and identified with nature, but in millions of gods, a god for every object, every act. 
Meaning of the word marked with <WSD> tags:  Belief that every object (animate or inanimate), idea (abstract or concrete), and action is inhabited by its own independent supernatural spirit; worship of such spirits.