“Besides the importance of land and religion, the existence of a specific religion among a distinct group of people is probably a fundamental element of human experience.”

Interview (July 1998)

Darling: A Spiritual Autobiography (2013)

Wording in Ideas and Opinions: The Jewish scriptures admirably illustrate the development from the religion of fear to moral religion, a development continued in the New Testament. The religions of all civilized peoples, especially the peoples of the Orient, are primarily moral religions. The development from a religion of fear to moral religion is a great step in peoples' lives. And yet, that primitive religions are based entirely on fear and the religions of civilized peoples purely on morality is a prejudice against which we must be on our guard. The truth is that all religions are a varying blend of both types, with this differentiation: that on the higher levels of social life the religion of morality predominates.
1930s, Religion and Science (1930)
Context: It is easy to follow in the sacred writings of the Jewish people the development of the religion of fear into the moral religion, which is carried further in the New Testament. The religions of all civilized peoples, especially those of the Orient, are principally moral religions. An important advance in the life of a people is the transformation of the religion of fear into the moral religion. But one must avoid the prejudice that regards the religions of primitive peoples as pure fear religions and those of the civilized races as pure moral religions. All are mixed forms, though the moral element predominates in the higher levels of social life.

There is, after all, nothing more natural than rape. But no one would argue that rape is good, or compatible with a civil society, because it may have had evolutionary advantages for our ancestors. That religion may have served some necessary function for us in the past does not preclude the possibility that it is now the greatest impediment to our building a global civilization.
Source: 2000s, Letter to a Christian Nation (2006), p. 90-91

An introduction to this book
The Religion of God (2000)

(1847)

Address at the opening of the Exhibit on the World's Religions at Santa Clara University (31 March 2005) http://www.scu.edu/ethics/practicing/focusareas/global_ethics/laughlin-lectures/kung-world-religions.html
Address at the opening of the Exhibit on the World's Religions at Santa Clara University (31 March 2005) note: Elaborations and extensions of this declaration occur in Küng's later writings, including: There will be no peace among the nations without peace among the religions. There will be no peace among the religions without dialogue among the religions. There will be no dialogue among the religions without global ethical standards. There will therefore be no survival of this globe without a global ethic.
Source: Christianity: Essence, History, Future

Speech in Merthyr Tydfil (November 1890), quoted in Thomas Jones, Lloyd George (London: Oxford University Press, 1951), p. 11.
Backbench MP

Source: God Is Red (1973), p. 293