The Science of Religion: Fundamental Faiths Expressed in Modern Terms is a book written by Daniel A. Simmons and originally published in 1916. The book aims to explore the fundamental tenets of various religions and present them in a scientific and modern language.

Simmons discusses the origins and history of religions such as Christianity, Judaism, Islam, Hinduism, and Buddhism, and analyzes their core beliefs and practices. He also examines the relationship between religion and science, arguing that they are not mutually exclusive but rather complementary.

The book provides a comprehensive overview of the major world religions and their impact on human society, culture, and morality. Simmons' writing style is clear and concise, making the book accessible to readers of all backgrounds and beliefs. Overall, ""The Science of Religion"" is a valuable resource for anyone interested in understanding the diverse and complex nature of religion and its role in shaping human history and culture.