American Exorcism Male God
America, 1980.
No sooner had Xu Yi transmigrated than he was put on the dissection table; then he gradually came to understand the true nature of this world.
"Studying medicine can't exorcise undead demons; I must become an exorcist!" he resolved silently to himself.
On a misty, rain-soaked night.
"Miss Evil Spirit over there, the night is cold and damp; be careful not to catch a chill! Come over here and warm yourself by the fire!" Xu Yi said, holding a lighter, as the pale gold flame slowly approached the other.
The Evil Spirit shrank back, looking at Xu Yi with fear.
"Don't be afraid, I just want to warm you up..." Xu Yi's face broke into a warm smile, "by setting you on fire!"
Ding dong! Ding dong!
"Sign-in at the Land of Fear successful, Resurrection Coin awarded!"
"Synthesis pathway requirements met, do you wish to combine the following entries?"
Psychic + Scholar + Painter = Psychic Painter!
Saintly Offspring + Gunfight Technique + Revolver Mastery = Holy Gunslinger!
Undead + Revelation + Holy Nation = God!
Reincarnation. System. Most likely Harem. I only read the free chapters, so I don't know if he gets all the girls, only 1 or none. MC is Xu Yi with some kind of supernatural system. Just like how it's impossible to avoid grinding stats, materials and other things in a game, the MC grinds for his perks. Writing quality isn't bad, but the constant switching of names or misspellings can get confusing. It's not a terrible read. Try it out and see if you like it or don't.