That's a good point! Perhaps the powers should be renamed / redefined for the Serpents of the Light? The Aspect of God would be instead attributed to Damballa, for example.

Alternatively, one could view the powers as some sort of defiantly sacrilegious act? "See? I assume your deity's form to abuse it for my own ends!" Given the hatred the Setites have for the Serpents, that they were so provoked does make a certain degree of sense!