Most people who are religious believe in the existence of evil. Even if you don't believe in the existence of evil there is the obvious question of suffering.
A central tenet of Christianity, Islam and Judaism is that there is one God. He is all powerful, all knowing and all good. If someone is suffering, then, how can a good God allow that suffering to continue? If a human being has the means to help someone who is suffering and fails to do so we would certainly not call him wholly good.
God is aware of the suffering of all human beings. From that of a young child sold into bonded labour in a Pakistani carpet factory to that of a millionaire dying of cancer in an American private hospital to that of the woman who is beaten every evening by her drunken husband. All these things he knows. He also knows how to stop it from happening, since he is all-knowing, and can do so, since he is all-powerful. If he is all good then he should WANT to do so. So why doesn't he?
No God who can permit such suffering (and of course there are much more intense forms of suffering than those I have described above) when he has the ability to stop it can be considered to be good. God, under this scrutiny, has failed to live up to even the most basic moral standards. The statements 'God is omnipotent. God is wholly good. Evil exists.' are logically inconsistent.
God is dead
"God is dead. God remains dead. And we have killed him. How shall we, the murderers of all murderers, console ourselves? That which was holiest and mightiest of all that the world has yet possessed has bled to death under our knives - who will wipe this blood off us? With what water could we purify ourselves? What festivals of atonement, what sacred games shall we need to invent? Is not the greatness of this deed too great for us? Must not we ourselves become gods simply to seem worth of it? There has never been a greater deed - and whoever shall be born after us, for the sake of this deed he shall be part of a higher history than all history hitherto."
