 Russell’s writings on religion and related topics include Chapter 15 of his A Critical Exposition of the Philosophy of Leibniz (1900), as well as A Free Man’s Worship (1923b),  Why I Am Not a Christian (1927c), reprinted in Why I am Not a Christian and Other Essays on Religion and Related Subjects (A1957), “The Existence and Nature of God” (1939), “Is There a God?” (1952) and What I Believe (A2013). 