There’s one problem: There’s no evidence Jefferson ever said it. The Jefferson Library Collection at Monticello lists it on a page of spurious Jefferson quotes.

Bruce Gleason, whose group paid for this and other recent atheism billboards that have gone up in O.C. in recent months, said Wednesday he wasn’t sure about the origin of the quote.

He agreed that Monticello was an authoritative source.

“You’re absolutely right,” he said. “I should have done the research before I put my billboard up.”