Source: What's the Worst That Could Happen?: A Rational Response to the Climate Change Debate (2009), Chapter 10 "Reader's Conclusion" (p. 206)
“Credulity is belief on slight evidence, with no evidence, or or against evidence. In this sense it is the infidel, not the believer, who is credulous. 'The simple,' says Solomon, 'believeth every word.”
Source: A Dictionary of Thoughts, 1891, p. 96.
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Tryon Edwards 57
American theologian 1809–1894Related quotes

Sometimes attributed to Contact (1985), but the quote does not appear in that book.
It appears attributed to Sagan in Judson Poling's 2003 book "Do Science and the Bible Conflict?", but without source.
Misattributed
Source: Via Google Books https://books.google.com/books?id=Ondv5WzhYYYC&pg=PA21&dq=Sagan

“The faith of religion is belief on insufficient evidence.”
The Rigveda: A Historical Analysis (2000), Chapter 7 : The Indo-European Homeland

Source: 1950s, Unpopular Essays (1950)