I find the many, many mentions of God in The Princess Bride to be incredibly intriguing. It is by all means mentioned that God exists, and characters are obviously familiar ("I don't like killing a girl," the Spaniard said. "God does it all the time; if it doesn't bother Him, don't let it worry you."). That quote alone establishes Him as a higher being, just as we perceive God. He is a God who can perform miracles (according to Buttercup, "There is a God; I know that. And there is love; I know that too; so Westley will save me."). A God which kings put their faith in ("Good. Then I promise you this as God himself is my witness: answer the next question and I will set you free this night," Humperdinck) and a God who can also face doubt. The only real person who seems to question the authority of God is Inigo, and even then that is a brief lapse of "If there is a God." Beyond this, every main character mentions God at one point or another: Buttercup herself, Westley, Humperdinck, Fezzik, Vizzini, and Inigo. The only two who notably do not are A. Miracle Max and B. Count Rugen, both characters who exist in complication to the character of God. Miracle Max is able to perform miracles (shocker, could you tell by the name or no?) and bring people back to life or into better health, which goes against the entire existence of God, who should perform those Himself, while Rugen is a man of science, his beliefs likely formulated more in what he has managed to discover while he delivers death with his own hands. He is also a very, very notable liar in comparison to Humperdinck (who is also a liar, he just acts like he isn't).
The most religious of all, however, or just in the relevance of God to their story, is Buttercup. Buttercup, who pronounces herself to very much believe in a higher being above her who will save her, just as her Westley will. Buttercup, who dreams many times of her child and references God through Humperdinck, and her own thankfulness to the heavens for her son being born. She is the most faithful, and is subsequently awarded for it. The way she speaks of Westley is almost deifying him, in a sense, as someone who can do anything, accomplish anything, even avoid death. However, is that not a denial of God in its own right?
