An award-winning novel by Neil Gaiman, American Gods is a blend of both modern religions and ancient mythologies. Published in 2001 by British Publishing House Headline, this novel alludes to themes previously explored by Gaiman's The Sandman narrative.
The novel focuses on the idea that the existence of gods, goddesses and other mythological creatures is dependent upon humanity's belief in them. Indeed, the gods are shown as a direct projection of the faith that produced them. Consequently, the strength of each divine being is derived from the strength of humanity's belief in them; without that belief, their powers begin to wane.