Sigmund Freud was a proponent of atheism who argued that theism was detrimental to mental health.<ref name="christtoday">McGrath, Alister (February 28, 2005). [http://www.christianitytoday.com/ct/2005/003/21.36.html "The twilight of atheism"]. ''Christianity Today'' website. Retrieved on May 23, 2015.</ref> [[Oxford]] Professor [[Alister McGrath]], author of the book ''The Twilight of Atheism'', stated the following regarding Freud: | Sigmund Freud was a proponent of atheism who argued that theism was detrimental to mental health.<ref name="christtoday">McGrath, Alister (February 28, 2005). [http://www.christianitytoday.com/ct/2005/003/21.36.html "The twilight of atheism"]. ''Christianity Today'' website. Retrieved on May 23, 2015.</ref> [[Oxford]] Professor [[Alister McGrath]], author of the book ''The Twilight of Atheism'', stated the following regarding Freud: |