There’s an interesting article discussing the origin of our belief that Tertullian wrote, “I believe because it is absurd”, at aeon.com,
‘I believe because it is absurd’: Christianity’s first meme
by Sam Dresser.
The article is another warning not to thoughtlessly take on board popular “knowledge” that “everyone knows to be true”.
I learned of it through another discussion, one on the Westar Institute site, clarifying the diverse meanings of the word “faith” by Bernard Brandon Scott, The Trouble with Faith.