Hey Azure Lily, I noticed you mentioned using the Cyrillic alphabet in the chat box.
Now, it sounds very very cool to me that someone is keen on learning our alphabet, but if you wanted to connect it to Tengriism, I must say it won't do you much good. See, the Cyrillic alphabet was based on the Glagolitic alphabet, which was invented about 2 centuries after the Bulgarians became Christians. Besides, both Cyrillic and Glagolitic alphabets are Slavic.
Now if you wanted to connect some sort of script to Tengriism, it would be Protobulgarian runes. There are very few sources on them and as far as I know, there have been discovered about 164 of them and many of them have not been deciphered yet.
You may find this link
You may also want to research Mongolian alphabets.