Everything!
"Christianity was from the beginning, essentially and fundamentally, life's nausea and disgust with life, merely concealed behind, masked by, dressed up as, faith in 'another' or 'better' life. Hatred of 'the world,' condemnations of the passions, fear of beauty and sensuality, a beyond invented to slander this life, at bottom the craving for nothing, for the end . . . all of this always struck me, no less than the unconditional will of Christianity to recognize only moral values, as the most dangerous and uncanny form of all possible forms of a 'will to decline' - at the very least an abysmal sickness, weariness, discouragement, exhaustion, and the impoverishment of life. For confronted with morality (especially Christian, or unconditional, morality), life must continually and inevitably be in the wrong, because life is something essentially amoral, and eventually, crushed by the weight of contempt and the eternal No, life must then be felt to be unworthy of desire and altogether worthless. Morality itself - how now? might not morality be 'a will to negate life,' a secret instinct of annihilation, a principle of decay, diminution and slander - the beginning of the end? Hence, the danger of dangers?
It was against morality that my instincts turned with this questionable book, long ago; it was an instinct that aligned itself with life and that discovered, for itself a fundamentally opposite doctrine and valuation of life - purely artistic and anti-Christian. What to call it? As a philologist and man of words I baptized it, not without taking some liberty - for who could claim to know the rightful name of the Antichrist? - in the name of the Greek god: I called it Dionysian."
-The Birth of Tragedy, Nietzsche
