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Explanation: I'm not sure about this because your question makes it sound adjectival, but "theurgy" is a noun. And the meaning I found in the dictionary doesn't quite fit "affecting God". In fact, it is quite the opposite: "the working of a divine or supernatural agency in human affairs." (per Random House).
It might help if you could vocalise the Hebrew (is it pronounced "the'urgi", "the'oregi", something else altogether?)