Deities associated with death take many different forms, depending on the specific culture and religion being referenced. Psychopomps, deities of the underworld, and resurrection deities are commonly called death deities in comparative religions texts. The term colloquially refers to deities that either collect or rule over the dead, rather than those deities who determine the time of death. However, all these types will be included in this article. Many cultures have incorporated a god of death into their mythology or religion. As death, along with birth, is among the major parts of human life, these deities may often be one of the most important deities of a religion. In some religions with a single powerful deity as the source of worship, the death deity is an antagonistic deity against which the primary deity struggles. The related term death worship has most often been used as a derogatory term to accuse certain groups of morally-abhorrent practices which set no value on human life, or which seem to glorify death as something positive in itself