The obvious counter point to that is that they also believe that you can invoke the other power also. And since, in their world view, there are only two powers, if your not invoking the first you must be invoking the second.Naah.
Where in the books does it say that it *is* "the other power" they're calling on? What's to say it isn't *"God"* that makes their magic work???
Fuck, they claim to believe he *actually* did it for Moses and people like him -- burning bushes and the like -- so why shouldn't *that* be what these fairy tales are portraying?
Naah, sorry, Jay... But their world view is certainly NOT "self-consistent and resonable"; on the contrary, it IS just stupid narrow-minded bigotry.
That's inherent in the concept of religion, I think; it's just that it only comes to the fore this starkly when you overdo it.