Why Are Divine Texts in Chinese Characters?

(New writer, drive on the road. Please pay attention. =^･ω･^=) Bai Xuan traveled to a small village in a fantasy world. This world has magical spells. And the top power in this world. Trembling because of Bai Xuan's arrival (the writing is not good, please forgive me ٩('ω')و) It's a bit like the fantasy in the past. I only write this kind of thing because it's simple.