Letter is unsigned. "You stand before the world now, the voicer of blasphemy."
"Civilization you have defined as 'forethought'. Clever!
Christ you have condemned. Most advanced!
Man you have belittled as a mere mass of dirt. Quite modern!
What will you do with your own soul?
You will try to define it, and fail, and let your failure justify your every blasphemy. 
You are judged."

Also in file: a transcription (TL); also a TL(CAR).