Personally, I think coffee represents neither angels nor Jesus, but St. Christopher.
In the movie, Hal's wife gave him St Christopher's necklace. This is also the only explanation in the movie about the miracle of coffee.
Saint Christopher, a kind giant in the Syrian river. When Jesus wanted to cross the river, he turned into a child and asked the saints to carry him on his back.
The saint felt that the child was heavy and asked him why it was so heavy. Jesus said, "Because I have carried all the sufferings of the world."
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