This historical deep dive explores how Deism—a rational belief in a non-interventionist creator—profoundly shaped the founding of the United States. Influencing key figures like Jefferson, Franklin, and Paine, Deism provided the moral and philosophical foundation for America’s Enlightenment-inspired documents like the Declaration of Independence and Constitution. With an emphasis on religious liberty, reason, and secular government, the Founders created a republic rooted not in religious dogma but in natural law and human rights. The essay traces this ideological evolution and its lasting impact on American society, politics, and culture today.