“I should like to see before I die, and think of it daily more and more, the commencement of Jesus Christ's christianism in the world, where I am sure people may be made a hundred times happier than by its present forms, Judaism, ascenticism, Bullarism.”

Source: Beach Music

1810s, The Everlasting Gospel (c. 1818)

A Week on the Concord and Merrimack Rivers http://www.gutenberg.org/dirs/etext03/7cncd10.txt (1849), Sunday
Context: I trust that some may be as near and dear to Buddha, or Christ, or Swedenborg, who are without the pale of their churches. It is necessary not to be Christian to appreciate the beauty and significance of the life of Christ. I know that some will have hard thoughts of me, when they hear their Christ named beside my Buddha, yet I am sure that I am willing they should love their Christ more than my Buddha, for the love is the main thing, and I like him too.

Dialogue between Russell and his daughter Katharine, as quoted in My Father – Bertrand Russell (1975)
Attributed from posthumous publications

Letter to Lucy Donnelly (23 June 1946)
1940s

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 3.

As quoted by William Rees-Mogg in The Times [London] (4 April 2005) {not found}. Gandhi here makes reference to a statement of Jesus: “No servant can serve two masters; for either he will hate the one and love the other, or else he will be loyal to the one and despise the other. You cannot serve God and mammon." (Luke 16:13); also partly quoted in Christianity in the Crosshairs: Real Life Solutions Discovered in the Line of Fire (2004, p. 74 books.google http://books.google.de/books?id=I7_5OM2VWuMC&pg=PA74) by Bill Wilson.
A variation is found in Bombay Sarvodaya Mandal & Gandhi Research Foundation's website mkgandhi.org http://www.mkgandhi.org/africaneedsgandhi/gandhi's_message_to_christians.htm. Christian missionary E. Stanley Jones, who spent much time with Gandhi in India, is said to have askedː “Mr Gandhi, though you quote the words of Christ often, why is it that you appear to so adamantly reject becoming his follower?". To this, Gandhi is said to have repliedː “Oh, I don’t reject your Christ. I love your Christ. It is just that so many of you Christians are so unlike your Christ”. Jones would write a book called " Mahatma Gandhi: An Interpretation https://archive.org/details/mahatmagandhiani000019mbp" (1948), where he included excerpts of his personal correspondance with Gandhi, but he did not include this conversation.
No further sources for Gandhi have been yet found; but a similar quote is attributed to Bara Dadaː "Jesus is ideal and wonderful, but you Christians -- you are not like him." Source - Jones, E. Stanley. The Christ of the Indian Road, New York: The Abingdon Press,1925. (Page 114)
Disputed

Appendix
1980s, At Home (1988)