If you do not want to stop the wheels of progress; if you do not want to go back to the Dark Ages; if you do not want to live again under tyranny, then you must guard your liberty, and you must not let the church get control of your government. If you do, you will lose the greatest legacy ever bequeathed to the human race—intellectual freedom. Now let me tell you another thing. If all the energy and wealth wasted upon religion—in all of its varied forms—had been spent to understand life and its problems, we would today be living under conditions that would seem almost like Utopia. Most of our social and domestic problems would have been solved, and equally important, our understanding and relations with the other peoples of the world would have, by now, brought about universal peace. Man would have a better understanding of his motives and actions, and would have learned to curb his primitive instincts for revenge and retaliation. He would, by now, know that wars of hate, aggression, and aggrandizement are only productive of more hate and more human suffering. The enlightened and completely emancipated man from the fears of a God and the dogma of hate and revenge would make him a brother to his fellow man. He would devote his energies to discoveries and inventions, which theology previously condemned as a defiance of God, but which have proved so beneficial to him. He would no longer be a slave to a God and live in cringing fear!

An Atheist Manifesto