While few polls have focused specifically on flat-Earth beliefs, other national polls have suggested that Americans are shaky on facts generally taught by the time they reach fourth grade. Another 23 percent of flat-Earth believers called themselves 'somewhat religious,' while 25 percent said they were either not very religious or not religious at all. According to the results, 52 percent of those who said the world was flat also called themselves 'very religious,' a descriptor that only 20 percent of Americans as a whole use for themselves. The most predictive demographic factor that explains flat-Earth belief appears to be religion, the YouGov survey suggested. People who reported incomes of less than $40,000 a year were slightly less likely to say the world was round than people who made higher incomes (79 percent versus 87 percent in the $40,000 to $80,000 income bracket, and 92 percent in the $80,000 and up income bracket). There weren't many differences in flat-Earth beliefs across regions of the country or between genders or people of different political persuasions.

Flat earther meme