This document discusses the origins of religion beginning with Adam and Eve's two sons, Cain and Abel, who made sacrifices to God. It notes that Cain's sacrifice was by his own works while Abel's was by faith. It suggests this shows where fanaticism and religious confusion began. It then reviews Cain and Abel's sacrifices in more detail and discusses how Cain became jealous when God accepted Abel's sacrifice based on revelation and faith rather than Cain's own works.