Edward Carpenter 
Pagan And Christian Creeds, Their Origin And Meaning [EPUB ebook] 

This book provides a systematic and logical approach to the origins of religion. Many common themes are shown to exist between Christianity and earlier Pagan religions that go back in time centuries before Christianity itself. Carpenter makes an effort to get to the very roots of religion in this book. He’s trying to uncover where our religious concepts first originated, and reveals an evolutionary sequence which starts with phallic and procreative cults as having the earliest known impact. Following this came a cult of magic, much along the lines of Frazier’s The Golden Bough, where spirits and earth divinities were worshipped. Lastly, came the belief in actual God-figures that came down from heaven. A big part of early religion also concerns the consciousness. (Amazon)