Pantheology n. : A system of theology embracing all religions; a complete system of theology.

Example:


Taxonomy
Wiktionary, system of theology, free dictionary, search, religions, complete system, François Rabelais, The Histories, Histories of Gargantua and Pantagruel, Parliament of Paris, true spring, justice, Samuel Kidd, China, Illustrations, Philosophy, Antiquities, Customs.

Defination from the web:
... and Parliament of Paris, places in which is to be found the true spring and source of the lively idea of pantheology, and all manner of justice. ... universe, since much confusion has, no doubt, been created by their nomenclature being intermingled with the Grecian mythology and pantheology. ...