Yeah, I beat this game. It's actually pretty fun once you start to understand what the heck you have to do. hehe.
I don't remember what the text says, but what's supposed to happen is that your character starts to pray in the corner and you then take control of your spirit(?) which appears roughly in the middle of the screen. You're supposed to fly around shoot the devil in the head a number of times. I don't think the choice you make matters.
This was one of the few games I had early on, so I played it constantly back in the day. I didn't even know it was an arcade game until I saw it emulated in MAME. Funny enough, one of my arcade hang outs has the game in there right now. They have a small retro area that they swap out every month or so.
Hope that helps.