If God is allowed in the Constitution, man must abdicate. There is no room for both. If the people of the great Republic become superstitious enough and ignorant enough to put God in the Constitution of the United States, the experiment of self-government will have failed, and the great and splendid declaration that “all governments derive their just powers from the consent of the governed” will have been denied, and in its place will be found this: All power comes from God; priests are his agents, the people are their slaves.

Robert Green Ingersoll – “God in the Constitution”