An example for Persian influence in SE Asia is
Cham people of
Champa
The Islam theology that small band practices, is from Persia and that is Shiite Islam. And moreover, sometimes they mix Islam with some local gods. That means Allah is the highest God, but there are other gods like wind god, ocean god, rain god.....And a powerful
Fire god included. About the 18th century, this religion cocktail sometimes became a shaman cult of Fire God.
Champa was one of the first bases spreading Islam in SE Asia.
Later, Shiite Islam theology were attacked as "unorthodox" and supplanted by Sunnite Islam, came along with the Turkish military aids("influences") for Malacca and Aceh (Another Cham Kingdom).
After the Vietnamese invasion of Champa. Cham Islam was isolated from the world. Wich leads to
this:
They pray to Ali because they
were Shiite.
Btw, I'm Vietnamese.