Well, I certainly don't want to start a religious arguement, but I'd still argue it's all fictional. The letters, if they are genuine are written about fictional events. Even if there's some shred of history there.
Of course, just my own opinion. I don't believe in gods, faries, goblins, ghosts or Jesus, Santa Claus, or the Tooth Fairy. But anyone is free to believe in any or all of them.
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