How cool! how did you find this out? I was raised in Canada and America so I'm heavily influenced by Christianity and, I don't know much about the Vietnamese religion besides, things like the Au Lac creation myth. are you Viet? if i remember correctly Maxis Orientis is Chinese?
I searched "Mahakala". Back when I was exposing Buddhism and "reversing" the slander against our Gods, I saw that Buddhists made mention of a Deity by the name of "Mahakala", which is Old Sanskrit. They labeled Mahakala as being an "evil monster", and STanBlank from China even told me that they make horror movies about him.
Upon doing further research, I found that that Mahakala is also Lord Shiva, or at least one of Lord Shiva's wrathful sides which means he must therefore be our Father Satan. Buddhists texts however distorted the meaning of this into making him an "evil monster who roams forests and drinks blood", when clearly anything in regards to "eating/raping" in ancient mythology is all allegorical.
According to translation in-between ancient texts, Mahakala has been recorded in civilizations that wrote in Chinese as "大黑天", which when transliterated into Roman script, renders as
Đại Hắc Thiên in Vietnamese. In the East Asian languages, it renders as
Dàhēitiān and
Daaih'hāktīn (Mandarin/Cantonese),
Daeheukcheon (Korean),
Daikokuten (Japanese), nonetheless very similar. In addition, he is depicted as having a trident, a sword and the Goat is also one of his animals, which is in-line in what JoS has revealed about Satan being Poseidon/Neptune in Greco-Roman mythology, having the Goat as one of His favorite animals, and since Mahakala/Đại Hắc Thiên bears a Trident, it also only makes since Shiva and Poseidon are both depicted as having tridents. I went through a wild

dopamine rush

when I found this information out.
Ever since joining JoS, my intent was solely to help the Asians recover the history of their spiritual faiths and promote Oriental Satanic traditions.
Hope this helps! And have a

Happy Year of the Dragon!

And I understand your pain dealing with Christianity, yes I am Maxis Orientis but I am not Chinese or Vietnamese. Sadly my particular Asian country of origin has a serious Christianity issue as well, and we used to venerate Dragons as did the Asians of the Ancient World, but the stupid church cut us off and my particular sub-race has been spiritually and morally bankrupt.
Here's some links to help you out:
en.wikipedia.org
en.wikipedia.org
HS