Polls show almost half of US adults believe that Earth is only 10,000 years old, whereas scientists consider our planet to be 4.56 billion years old. Examining these conflicting views illuminates aspects of the perceived conflict between religion and science, and helps us understand the battles between “evolutionist” and “creationist” advocates. This book examines how we approach knowledge, and how we look at certainty. It disentangles the threads of the traditional knowledge we are taught from the knowledge we gain from our own investigation of truth. It argues that nature, the basis of science, and scripture, the basis of religion, derive from a single source. Because of their shared origins, religious and scientific perspectives grounded in verifiable truths must be in harmony. The book presents the science behind the reliability of isotopic dates, and critiques young-earth creationist attacks on isotopic studies. Though the nature of time is a philosophical issue, its measurement is a scientific venture that has affirmed that Earth is 4.56 billion years old. The harmony of science and religion, based on recognition of their single source, is a prerequisite for the progress of humanity as a whole.