Arthur Helps quote: “Some persons, instead of making a religion for their God, are content to make a god of their religion.”

“There are some forms of religion that must make God weep.”

Karen Armstrong (1944) author and comparative religion scholar from Great Britain

NOW interview (2002)
Context: There are some forms of religion that must make God weep. There are some forms of religion that are bad, just as there's bad cooking or bad art or bad sex, you have bad religion too. Religion that has concentrated on egotism, that's concentrated on belligerence rather than compassion. … But then you have to remember that this is what human beings do. Secularism has shown that it can be just as murderous, just as lethal … as religion. Now I think one of the reasons why religion developed in the way that it did over the centuries was precisely to curb this murderous bent that we have as human beings.

“Make sure that your religion is a matter between you and God only.”

Ludwig Wittgenstein (1889–1951) Austrian-British philosopher

Comment to Maurice O'Connor Drury, as quoted in Wittgenstein Reads Freud : The Myth of the Unconscious (1996) by Jacques Bouveresse, as translated by Carol Cosman, p. 14
Attributed from posthumous publications

“The religion of the future will be cosmic religion. It will transcend personal God and avoid dogma and theology.”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

Misattributed
Variant: The religion of the future will be a cosmic religion. It should transcend a personal God and avoid dogmas and theology. Covering both the natural and the spiritual, it should be based on a religious sense arising from the experience of all things, natural and spiritual as a meaningful unity. If there is any religion that would cope with modern scientific needs, it would be Buddhism.
These two statements are very similar, widely quoted, and seem to paraphrase some ideas in the essay "Religion and Science" (see below), but neither of the two specific quotes above been properly sourced. Notable Einstein scholars such as John Stachel and Thomas J. McFarlane (author of Buddha and Einstein: The Parallel Sayings) know of this statement but have not found any source for it. Any information on any definite original sources for these is welcome.
This quote does not actually appear in Albert Einstein: The Human Side as is sometimes claimed.
Only two sources from before 1970 can be found on Google Books. The first is The Theosophist: Volume 86 which seems to cover the years 1964 http://books.google.com/books?id=7pLjAAAAMAAJ&q=1964#search_anchor and 1965 http://books.google.com/books?id=7pLjAAAAMAAJ&q=1965#search_anchor. The quote appears attributed to Einstein on p. 255 http://books.google.com/books?id=7pLjAAAAMAAJ&q=%22natural+and+spiritual%22#search_anchor, with the wording given as "The religion of the future will be a cosmic religion. It should transcend a personal God and avoid dogmas and theology. Covering both the natural and the spiritual, it should be based on a religious sense arising from the experience of all things, natural and spiritual, as a meaningful unity. Buddhism answers this description." An identical quote appears on p. 284 http://books.google.com/books?id=YpsfAQAAIAAJ&q=%22dogmas+and+theology%22#search_anchor of The Maha Bodhi: Volume 72 published by the Maha Bodhi Society of India, which seems to contain issues from throughout 1964 http://books.google.com/books?id=YpsfAQAAIAAJ&q=%22volume+72%22#search_anchor.
A number of phrases in the quote are similar to phrases in Einstein's "Religion and Science". Comparing the version of the quote in The Theosophist to the version of "Religion and Science" published in 1930, "a cosmic religion" in the first resembles "the cosmic religious sense" in the second; "transcend a personal God" resembles "does not involve an anthropomorphic idea of God"; "covering both the natural and the spiritual" resembles "revealed in nature and in the world of thought"; "the experience of all things, natural and spiritual, as a meaningful unity" resembles "experience the totality of existence as a unity full of significance"; and "Buddhism answers this description" resembles "The cosmic element is much stronger in Buddhism". These phrases appear in the same order in both cases, and the ones from "Religion and Science" are all from a single paragraph of the essay.
Context: Buddhism has the characteristics of what would be expected in a cosmic religion for the future: It transcends a personal God, avoids dogmas and theology; it covers both the natural and the spiritual, and it is based on a religious sense aspiring from the experience of all things, natural and spiritual, as a meaningful unity.

“The beginning of religion, more precisely its content, is the concept of religion itself, that God is the absolute truth, the truth of all things, and subjectively that religion alone is the absolutely true knowledge.”

Georg Wilhelm Friedrich Hegel (1770–1831) German philosopher

Lectures on Philosophy of Religion, Volume 1 (1827)

“The ground of all religion, that which makes it possible, is the relation in which the human soul stands to God.”

John Campbell Shairp (1819–1885) British writer

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 493.

“We rebel against the impossible. I sense a wish in some professional religion-mongers to make God possible, to make him comprehensible to the naked intellect, domesticate him so that he's easy to believe in.”

Madeleine L'Engle (1918–2007) American writer

The Crosswicks Journal, The Irrational Season (1977)
Context: We rebel against the impossible. I sense a wish in some professional religion-mongers to make God possible, to make him comprehensible to the naked intellect, domesticate him so that he's easy to believe in. Every century the Church makes a fresh attempt to make Christianity acceptable. But an acceptable Christianity is not Christian; a comprehensible God is no more than an idol.

“You should never revile people who are satisfied with their own religion… Listen you disciples of Christ! I, solicitous of your own welfare, tell you this truthfully… Diminution of Hari’s religion, anger, cruelty, subversion of authority and dissensions among the populace would result from reviling the religion of others. Increase of God’s religion, contentment, gentleness, harmony between the ranks would result from praising all religions. For each person his own religion is best; the same religion would be perilous for another person.”

John Muir (indologist) (1810–1882) Scottish Sanskrit scholar and Indologist

Subaji Bapu, MataparIkshAsikshA, from his reply to John Muirs Matapariksha, Cited by R.F. Young and quoted from Goel, S. R. (2016). History of Hindu-Christian encounters, AD 304 to 1996. Chapter 10. ISBN 9788185990354 https://web.archive.org/web/20120501043412/http://voiceofdharma.org/books/hhce/
About John Muirs Matapariksha