First of all, while loyalty is among the highest Irish virtues, I would treat loyalty to the gods with care. There is absolutely nothing in ancient polytheism that indicates exclusivity: if you wanted to worship the gods of other tribes, no sanctions existed to discourage you. Indeed, the cult of Lugus would never have risen to the prominence that it did if an exclusionary attitude existed.

But this comes with a “however.” Even though it’s fine to worship, say, Irish and Egyptian gods, it’s important to learn and maintain the Irish and Egyptian traditions around each. In other words, mixing them together into one hodge-podge flies in the face of polytheism, to me. I believe that honoring them separately, with their own traditions intact, creates a stronger and deeper bond to each.

All of the above, though, is in reference to practicing different polytheistic traditions side by side. It becomes more complicated if you add Christ to the mix. This is because Christian teaching typically comes with a doctrine of their god being the highest, best, or only. Combining that with tribal polytheism usually just means the tribal gods get demoted to lesser beings than God. I don’t approve.

So do I celebrate St. Patrick’s Day? Absolutely not. And I no use for a single Creator deity above and beyond the gods – nor for a savior, since there’s nothing to save us from.

Finally though, I notice you couched your question in terms of sorcerers. While neopagans like to stake out magic as something ancient and pagan, the truth is that almost all of Western magic is Judeo-Christian. It was developed during the middle ages and the connections to ancient Greek and Middle Eastern practice is minimal. Then in the New World it mixed with many African and Native American practices who are all highly syncretic and don’t mind adding Christianity.

So, I wouldn’t really bash magical practitioners for using Christian language; it’s central to some of the best Western magic out there.

I think giving each science a patron deity would be a worthy project, for a pantheon like the Egyptian one that has such specific deities. A theonomy for a free society.