“In talking of the Christian world, in English and, I suppose, in all the other languages of the Christian world we use two terms: Christianity and Christendom. Christianity means a religion, in the strict sense of that word, a system of belief and worship and some clerical or ecclesiastical organization to go with it. If we say Christendom, we mean the entire civilization that grew up under the aegis of that religion, but also contains many elements that are not part of that religion, many elements that are even hostile to that religion. Let me give one simple example. No one could seriously assert that Hitler and the Nazis came out of Christianity. No one could seriously dispute that they came out of Christendom. In talking of Islam, we use the same word in both senses, and this gives rise to considerable confusion and misunderstanding. There are many things that are described as part of Islam, which are indeed part of Islam, if we take the word as the equivalent of Christendom, but are very much not part of Islam are even alien or hostile to Islam if we take the word Islam as the equivalent of Christianity. I think this is a very important point, which one should bear in mind.”

Source: 1850s, Attack upon Christendom (1855), p. 97

Source: The Subversion of Christianity (1984), pp. 35-36

Tilak, reproduced in V.D. Savarkar: Hindutva, and quoted in Elst, Koenraad (2002). Who is a Hindu?: Hindu revivalist views of Animism, Buddhism, Sikhism, and other offshoots of Hinduism. ISBN 978-8185990743

"Where in the World Are We?" (2006)

Chap. 2: The New Being
The New Being (1955)

Quoted by Nishitha Desai in Lusotopie 2000, p. 474

The Great Seesaw: A New View of the Western World, 1750-2000 (1988)

"The Emotional Factor"Religion is based, I think, primarily and mainly upon fear.
Often paraphrased as "The Christian religion has been and still is the principal enemy of moral progress in the world."
1920s, Why I Am Not a Christian (1927)
Context: You find as you look around the world that every single bit of progress of humane feeling, every improvement in the criminal law, every step toward the diminution of war, every step toward better treatment of the colored races, or even mitigation of slavery, every moral progress that there has been in the world, has been consistently opposed by the organized churches of the world. I say quite deliberately that the Christian religion, as organized in its churches, has been and still is the principal enemy of moral progress in the world.

Exclusive Interview with Aron Ra – Public Speaker, Atheist Vlogger, and Activist https://conatusnews.com/interview-aron-ra-past-president-atheist-alliance-america/, Conatus News (May 17, 2017)