The real difference is this: the Christian says that he has knowledge; the Agnostic admits that he has none; and yet the Christian accuses the Agnostic of arrogance, and asks him how he has the impudence to admit the limitations of his mind. To the Agnostic every fact is a torch, and by this light, and this light only, he walks.The Agnostic knows that the testimony of man is not sufficient to establish what is known as the miraculous. We would not believe to-day the testimony of millions to the effect that the dead had been raised. The church itself would be the first to attack such testimony. If we cannot believe those whom we know, why should we believe witnesses who have been dead thousands of years, and about whom we know nothing?The Agnostic takes the ground that human experience is the basis of morality. Consequently, it is of no importance who wrote the gospels, or who vouched or vouches for the genuineness of the miracles. In his scheme of life these things are utterly unimportant. He is satisfied that “the miraculous” is the impossible. He knows that the witnesses were wholly incapable of examining the questions involved, that credulity had possession of their minds, that 'the miraculous' was expected, that it was their daily food.

~ Robert G. Ingersoll

I cannot understand why we idle discussing religion. If we are honest—and scientists have to be—we must admit that religion is a jumble of false assertions, with no basis in reality. The very idea of God is a product of the human imagination. It is quite understandable why primitive people, who were so much more exposed to the overpowering forces of nature than we are today, should have personified these forces in fear and trembling. But nowadays, when we understand so many natural processes, we have no need for such solutions. I can't for the life of me see how the postulate of an Almighty God helps us in any way. What I do see is that this assumption leads to such unproductive questions as why God allows so much misery and injustice, the exploitation of the poor by the rich and all the other horrors He might have prevented. If religion is still being taught, it is by no means because its ideas still convince us, but simply because some of us want to keep the lower classes quiet. Quiet people are much easier to govern than clamorous and dissatisfied ones. They are also much easier to exploit. Religion is a kind of opium that allows a nation to lull itself into wishful dreams and so forget the injustices that are being perpetrated against the people. Hence the close alliance between those two great political forces, the State and the Church. Both need the illusion that a kindly God rewards—in heaven if not on earth—all those who have not risen up against injustice, who have done their duty quietly and uncomplainingly. That is precisely why the honest assertion that God is a mere product of the human imagination is branded as the worst of all mortal sins.

~ Paul A.m. Dirac