We're telling a story. And the demands of that are different from the demands of a documentary. The audience must believe in order to keep faith in the story.
Anyone who really studies Catholicism deeply is aware of the mystical nature of our faith. Even references to Christ's mystical body has connections to that principle.
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Ultimately it's a leap of faith and a leap of imagination to put yourself back in time into those conditions and situations and see how you would react.