I am confident that Rock-Paper-Scissors represents a symbolic battle of will and force of personality between two characters. There is no actual game of Rock-Paper-Scissors happening.
I could just picture it...
Immaculate: "Stop, heathen scum! Only the Faithful may pass!"
Protagonist: "Guys, trust us, we're totally on the level here. No need to fight, just let us go through!"
*ding!*
*several rounds of Rock Paper Scissors later*
Protagonist: "And rock beats scissors. I win!"
Immaculate: "Truly the Goddess guides thy hand. You may pass, faithful one!"
