I wanna get more annoyed with the protagonist, but in all honesty, he's acting pretty realistically in such a scenario scenario. He had zero experience with this supernatural stuff prior to this, after all. Hell, he's even smart enough to bring the holy water along just in case, even if he didn't want to believe the stuff the priest was saying.
Poor Toriko's actually possessed though. I was kinda hoping she was just a demon posing as a human since that would've made things easier. But it looks like she's gonna have a bad time.