Author
Like Karlheinz Deschner, Kahl is best known for his critiques of Christianity. See his The Misery Of Christianity (Das Elend des Christentums)
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Some German posters to the [message board] can now confirm Kahl's atheism:
...on the site http://www.mazeway.de/~ibka/Artikel/ag98/atheismus.html is an article of Kahl which begins "Atheist wurde ich durch mein Theologiestudium." (I became atheist by my study of theology). I have also a book by Friedrich Heer/Joachim Kahl/Karlheinz Deschner "Warum ich Christ/Atheist/Agnostiker bin; Kiepenheuer & Witsch K