A cult's theology is binding on the god involved: it is possible for that god to believe (and see, just like Winston Smith in 1984) that other gods are mythical, or jumped-up demons, or failing older spirits, even while those gods actually exist and thrive and act in the cosmos, even while working against him.
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Meles, the eyes in midnight bands
the plagues would see him dead
yet Meles, his brood unchained
they ate the plagues instead