Analysis of the quotations from Leo Tolstoy’s «What I Believe», that Nietzsche copied out and worked on in late 1887-early 1888, shows that after reading this book Nietzsche significantly changed his attitude toward Christianity. Before that he did not see any difference between the teachings of Jesus Christ and historic Christianity, but from that moment on, following Tolstoy, he draws a sharp opposition between them. Still persisting in a very negative assessment of historical Christianity, he acknowledges the teaching of Christ as positive insofar as it contributes to the unfolding of the internal capabilities of the human being.