We have names for people who have many beliefs for which there is no rational justification. When their beliefs are extremely common we call them ‘religious’; otherwise, they are likely to be called ‘mad’, ‘psychotic’ or ‘delusional’... Clearly there is sanity in numbers. And yet, it is merely an accident of history that it is considered normal in our society to believe that the Creator of the universe can hear your thoughts, while it is demonstrative of mental illness to believe that he is communicating with you by having the rain tap in Morse code on your bedroom window. And so, while religious people are not generally mad, their core beliefs absolutely are.

Religious fanaticism is the most dangerous form of insanity.

Religion is a by-product of fear. For much of human history it may have been a necessary evil, but why was it more evil than necessary? Isn’t killing people in the name of god a pretty good definition of insanity?

Religion is like drugs, it destroys the thinking mind.

Religion is the impotence of the human mind to deal with occurrences it cannot understand.

Religious belief is without reason and without dignity, and its record is near-universally dreadful.

The weak spot of religion is its ridiculousness

Religion is a byproduct of fear. For much of human history, it may have been a necessary evil, but why was it more evil than necessary? Isn't killing people in the name of God a pretty good definition of insanity? Arthur C. Clarke, author

Madness, provided it comes as the gift of heaven, is the channel by which we receive the greatest blessings . . . the men of old who gave things their names saw no disgrace or reproach in madness; otherwise they would not have connected it with it the name of the noblest of arts, the art of discerning the future, and called it the manic art . . . So, according to the evidence provided by our ancestors, madness is a nobler thing than sober sense . . . madness comes from God, whereas sober sense is merely human.

"Religion is a system of wishful illusions together with a disavowal of reality, such as we find nowhere else but in a state of blissful hallucinatory confusion. Religion's eleventh commandment is "Thou shalt not question.

Christianity is the most ridiculous, the most absurd, and bloody religion that has ever infected the world.

[In a letter to Frederick the Great]

When one person suffers from a delusion, it is called insanity. When many people suffer from a delusion it is called a Religion.

When life itself seems lunatic, who knows where madness lies? Perhaps to be too practical may be madness. To surrender dreams, this may be madness ...Maddest of all is to see life as it is and not as it should be.

Madness is somewhere between chaos and having a dream.