It is now established by verifiable evidence that religion stultifies the brain and is the great obstacle in the path of intellectual progress. The more religious a person is, the more he is steeped in ignorance and superstition, the less is his sense of moral responsibility. The more intelligent a person, the less religious he is. There is an old saying that 'where there are three scientists, there are two atheists.' The countries whose governments are dominated by religion and religious institutions are the most backward. By the same token, the countries whose people are the most enlightened, and whose governments are based upon the principle of secularism—the separation of church and state—are the most progressive. And let me tell you: When man is intellectually free, the progress he will make is beyond calculation.

An Atheist Manifesto