“Birth control appeals to the advanced radical because it is calculated to undermine the authority of the Christian churches. I look forward to seeing humanity free someday of the tyranny of Christianity no less than Capitalism.”
Unknown source, often attributed to The Woman Rebel.
Misattributed
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Margaret Sanger 61
American birth control activist, educator and nurse 1879–1966Related quotes

Preface
Books, What's So Great about Christianity (2007)

Beyond the Last Thought: Freud's cigars and the long way round to Nirvana (p. 86)
The Silence of Animals: On Progress and Other Modern Myths (2013)

“We must advance … because Christianity and Freedom are incompatible”
Il faut avancer... parce que le christianisme et la liberté sont incompatibles
[in Gracchus Babeuf avec les Egaux, Jean-Marc Shiappa, Les éditions ouvrières, 1991, 72, 27082 2892-7]
On religion

Anarchism: Its Philosophy and Ideal (1896)
Context: Far be it from us not to recognize the importance of the second factor, moral teaching — especially that which is unconsciously transmitted in society and results from the whole of the ideas and comments emitted by each of us on facts and events of every-day life. But this force can only act on society under one condition, that of not being crossed by a mass of contradictory immoral teachings resulting from the practice of institutions.
In that case its influence is nil or baneful. Take Christian morality: what other teaching could have had more hold on minds than that spoken in the name of a crucified God, and could have acted with all its mystical force, all its poetry of martyrdom, its grandeur in forgiving executioners? And yet the institution was more powerful than the religion: soon Christianity — a revolt against imperial Rome — was conquered by that same Rome; it accepted its maxims, customs, and language. The Christian church accepted the Roman law as its own, and as such — allied to the State — it became in history the most furious enemy of all semi-communist institutions, to which Christianity appealed at Its origin.

Master Speaks (1967) Part 7: Bible Interpretation http://www.tparents.org/Moon-Books/sm-mast/MSTRSP-7.htm, (transcriptions of Q&A sessions in March-April 1965)

Source: Woman, Church and State (1893), p. 540 as quoted in K. M. Talreja, Holy Vedas and Holy Bible: A Comparative Study https://books.google.com/books?id=9qkoAAAAYAAJ, New Delhi: Rashtriya Chetana Sangathan, 2000

In reference to the Black Muslims who advocated Black Nacionalism. At his Interview in Playboy (January 1965) https://web.archive.org/web/20080706183244/http://www.playboy.com/arts-entertainment/features/mlk/04.html
1960s