hierology
Hierology (Greek ιερος, hieros, "sacred" or "holy", + λογος,
logos, "word", "account", or "reason") refers to the study of the
sacred and sacredness. It is generally pursued by those who find
real truth in many faiths and especially refers to philosophical
speculations about religion that involve the traditionsof multiple
cultures or belief systems. It differs from theology in that a god
or gods are not necessarily a focus and in that it may include
sources with no origin in Western philosophy or religion.
(Wikipedia)