Nietzsche violently exposed and criticized traditional Christian morality and modern reason. In epistemology, Nietzsche is an extreme anti-rationalist, who thoroughly criticizes any rational philosophy. He believes that the spiritual life of Europeans for two thousand years is centered on believing in God, and man is God's creation and appendage. The value of life, everything of people is pinned on God. Although the foundation of God's existence has begun to disintegrate since the Enlightenment, people still believe and worship God because there is no new belief. Nietzsche's famous saying "God is dead" is a heartless and fearless criticism of God. He said that he was the murderer of God through the mouth of a madman, and pointed out that God should be killed. Christian ethics fetters people's minds and suppresses people's instincts. If a man is free, he will kill God. Nietzsche believes that the decline of Christianity has its historical inevitability, from the religion of the oppressed to the religion of the rulers and oppressors.

Killing the god as a god ushered in the god of capital, the god of capital incarnation. Nietzsche ignored a basic fact: being enslaved by capital is not much freer than being enslaved by God. But his cry of "God is dead" and his sober enlightenment value cannot be underestimated.

Nietzsche believes that in a world without God, people have gained unprecedented opportunities and must establish new values, values centered on human will. Therefore, it is necessary to liquidate the traditional moral values. The traditional moral concept is God's last fortress, which deeply permeates people's daily life and corrodes people's hearts. Nietzsche claimed to be immoral and anti-Christian. He fiercely criticized Christian morality and virtues advocated by Christianity.