You are correct!
From our dictionary:
Also, Man•i•chee (man'i-kē").
an adherent of the dualistic religious system of Manes, a combination of Gnostic Christianity, Buddhism, Zoroastrianism, and various other elements, with a basic doctrine of a conflict between light and dark, matter being regarded as dark and evil.
of or pertaining to the Manicheans or their doctrines.