A priest in North America, what the hell is the Demon Gate system?

"Evil female ghost! Get out of that boy's body!" "Father, it's you who should be getting out of the body!" Li Ang didn't say anything more, but instead took out a star-spangled flag surrounded by purple aura. "Stubborn! Then go talk to my Ten Thousand Soul Banner!" "Ooh ooh ooh—" [Ding! Completed the sect's spirit-binding mission, reward: contribution points +10] Li Ang sighed silently. He had clearly transmigrated into an American priest, but ended up being bound to this demonic sect system, making his character increasingly strange... "Oh well, welcome to America, a place very suitable for the development of the demonic sect."