Nietzsche’s argued that the Christian system of faith and worship was not only incorrect, but harmful to society because it allowed the weak to rule the strong – it suppressed the will to power which was the driving force of human character. Nietzsche wanted people to throw off the shackles of our misguided Christian morality and become supermen – free and titanic.
However, without God he felt that the future of man might spiral into a society of nihilism, devoid of any meaning; his aim was for man to realize the lack of divine purpose and create his own values. The core of Nietzsche’s work, including Thus Spake Zarathustra (1883-92), Beyond Good and Evil (1886), The Birth of Tragedy (1872) was to find a meaning and morality in the absence of God. (Excerpt from bbc.co.uk)