|A Bible as children’s fable (Ѻ) retouching, the story Genesis, the backdrop to the “fable of Christ” being the centerpiece.|
The first, supposedly, to refer to the profits of the fable of Christ was pope Boniface VIII:
“The sums of money which the fable of Christ has produced the priests are incalculable.”— Boniface VIII (c.1290) 
“Just look at the popes (Julius III, Leo X) who themselves mocked their dignity and the other (Boniface VIII) who said, joking with his friends, ‘Ah! How rich we are from this fable of Christ!’”— Jean Meslier (1729), Testament (pg. 39) 
In 1514, Pope Leo X, at a lavish Good Friday banquet, in the Vatican, in the company of seven intimates, Leo X famously stated the following as he raised his toast glass to the air: 
“How well we know what a profitable superstition this fable of Christ has been for us and our predecessors.”
The pope's pronouncement, since characterized as the “most infamous and damaging statement about Christianity in the history of the Church”, was recorded in the diaries and records of both Pietro Cardinal Bembo (Letters and Comments on Pope Leo X, 1842 reprint) and Paolo Cardinal Giovio (De Vita Leonis Decimi..., op. cit.), two associates who were witnesses to it.
In circa 1789, French philosopher Constantin Volney, in his The Ruins: a Survey of the Revolutions of Empires, under partial influence of the readings of the draft works Charles Dupuis (1742-1766), argued that argued that Abraham and Sarah were derived from Brahma and his wife Saraswati, that Christ was related to “Christna” (Krishna), and that Brahmanism and Judaism shared a common Egyptian origin; Volney stated: 
“These various theological opinions are mere chimeras, allegories and mysterious symbols, under which moral ideas, and the knowledge of the operations of nature in the actions of the elements and the revolutions of the planets, are ingeniously depicted.”
In circa 1810, Johann Goethe stated that Christianity is a fairy tale: 
“Christianity is the fairytale of Christ.”(add)
Silent historians | Problem
See main: Silent historians problemIn 1909, freethinker John E. Remsburg (1848-1919), in his The Christ: a Critical Review and Analysis of the Evidence of His Existence, enumerated 41 Jesus-era writers, aka “silent” historians”, who should have recorded Christ tales but did not. 
“In the entire Christian century, Jesus is not mentioned by a single Greek or Roman historian, religious scholar, politician, philosopher or poet. His name never occurs in a single inscription, and it is never found in a single piece of private correspondence. Zero! Zip references!”— Bart Ehrman (c.2012)
In 2013, Michael Paulkovich, a former non-Christ-mythicist, i.e. he believed that “Jesus probably existed but had fantastic stories foisted upon”, in his No Meek Messiah: Christianity’s Lies, Laws and Legacy (Ѻ), building Remsburg, listed 126 writers, shown below, who should have, owing to his supposed fame, but did NOT write about Jesus. 
In circa 2010, Libb Thims did something similar in respect to checking Aristotle's collected works (322BC) for the names of Moses (1300BC) and in some sense Abraham (1813BC); Thims, to note, previously determined that Abraham did not exist, i.e. that the name is a transliteration of "father Ra born out of the Nun following the annual Nile river flood", aka Ab-Ra-ham.
The following are related quotes:
“Fables should be taught as fables, myths as myths, and miracles as poetic fancies. To teach superstitions as truth is a most terrible thing. The child mind accepts and believes them, and only through great pain and perhaps tragedy can he or she be in after years relieved of them. The reason for this is that a superstition is so intangible a thing that you cannot get at it to refute it.”— Hypatia (c.400)
1. Author. (2007). “The Criminal History of the Papacy: Part 3 of 3” (Ѻ), Nexus Magazine, 14(3), Apr-May.
2. Remsburg, John. (1909). The Christ: a Critical Review and Analysis of the Evidence of His Existence. Prometheus Books, 1994.
3. Paulkovich, Michael B. (2014). “God on Trial: The Fable of the Christ” (Ѻ), Free Inquiry, 34(5).
4. Haught, James A. (1996). 2000 Years of Disbelief: Famous People with the Courage to Doubt (§: Johann Goethe, pgs. 105-07). Prometheus.
5. (a) Volney, Constantin. (1789). The Ruins: a Survey of the Revolutions of Empires: to which is added the Law of Nature or Principles of Morality (txt) (pg. 176). Thomas Davison, 1826.
(b) Leask, Nigel. (2004). British Romantic Writers and the East (pgs. 104-105). Cambridge University Press.
6. (a) Villani, John. (c.1310). Publication. Publisher.
(b) Hallam, Henry. (1856). View of the State of Europe during the Middle Ages (ch. 7, pg. 304). Harper & Brothers.
(c) Thompson, Richard W. (1876). The Papacy and the Civil Power (pgs. 223-33) (Ѻ). Harper & Bros.
7. Meslier, Jean. (1729). Testament: Memoir of the Thoughts and Sentiments of Jean Meslier (translator: Michael Shreve; preface: Michel Onfray). Prometheus Books.
● Christ myth theory – Wikipedia.
● When did people start to deny Jesus as a historical person? (2014) – StackExchange.com.