A casual stroll through the lunatic asylum shows that faith does not prove anything.
In truth, there was only one Christian, and he died on the cross.
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.
from Nietzsche's The Birth of Tragedy, p.23, Walter Kaufmann transl.
Change of Cast. -- As soon as a religion comes to dominate it has as its opponents all those who would have been its first disciples.
from Nietzsche's Human, all too Human, s.118, R.J. Hollingdale transl.
The persecutor of God. -- Paul thought up the idea and Calvin rethought it, that for innumerable people damnation has been decreed from eternity, and that this beautiful world plan was instituted to reveal the glory of God: heaven and hell and humanity are thus supposed to exist - to satisfy the vanity of God! What cruel and insatiable vanity must have flared in the soul of the man who thought this up first, or second. Paul has remained Saul after all - the persecutor of God.
from Nietzsche's The Wanderer and his Shadow, R.J. Hollingdale transl.
“God is dead: but considering the state Man is in, there will perhaps be caves, for ages yet, in which his shadow will be shown.”