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Satan does not write anything, he has no body to do so. People write things. Judging by the things people write, the ability to use human language for evil is pretty big.
As a sidenote, the only mention of writings that were written by some heavenly or demonic being is (and that were actually on earth, not in some vision), as far as I am aware:
While there are mentions of books in visions and such, there seem to be no other mention of writings, on earth, done by heavenly of demonic beings.