Atheist spirituality
Compte-Sponville, Andre. The Little Book of Atheist Spirituality. Penquin 2008.
de Botton, Alain. Religion for Atheists. Random House 2012.
Science and religion
Dennett, Daniel. Breaking the Spell: Religion as a Natural Phenomenon. Viking 2006.
Einstein, Albert. Religion and Science. New York Times Magazine 1930.
Sagan, Carl. The Varieties of Scientific Experience. Penguin 2006.
The brain/neuroscience and religion
McNamara, Patrick. The Neuroscience of Religious Experience. Cambridge University Press 2009.
Newberg, Andrew. Principles of Neurotheology. Ashgate 2009.
Philosophical and theologial perspectives
Durkheim, Emile. The Elementary Forms of the Religious Live. 1912.
Dworkin, Ronald. Religion without God. Harvard University Press. 2013.
Eliade, Mircea. The Sacred and the Profane. 1957.
Fuller, Robert. Spiritual but not Religious. Oxford University Press 2001.
James, William. Varieties of Religious Experience. 1902.
Rue, Loyal. Religion is Not About God. Rutgers University Press 2005.
Smith, Huston. The World’s Religions. HarperOne 2009.
Stone, Jerome. The Minimalist Vision of Transcendence. SUNY Press 1992.
Streng F, Lloyd C, and Allen J. Ways of Being Religious. Prentice-Hall. 1973.
Tillich, Paul. Systematic Theology. 1973.
Religious experience
Otto, Rudolph. The Idea of the Holy. 1923.