ditheistic

Manichaeism: 3rd century ditheistic gnosticism that may have been influenced by Mandaeism.

For example, a ditheistic system would be one in which one god is creative, the other is destructive (cf. theodicy).

Ditheistic belief systems (a kind of dualism) explain the problem of evil from the existence of two rival great, but not omnipotent, deities that work in polar opposition to each other.

Some currents of Neopaganism, in particular Wicca, have a ditheistic concept of a single goddess and a single god, who in hieros gamos represent a united whole.

The opinion that Zoroastrianism was so severely dualistic that it was, in fact, ditheistic or even tritheistic would be widely held until the late 19th century (Dhalla, 1932:490-492; cf. Boyce, 2002:687).

However, bitheistic and ditheistic principles are not always so easily contrastable, for instance in a system where one god is the representative of summer and drought and the other of winter and rain/fertility (cf. the mythology of Persephone).