It may be surprising, but some people still believe it is. Here is an interesting debate the Al-Fayhaa TV aired in 2007, during which astronomy researcher is arguing with physicist on this subject:

It’s been nearly 500 years since Nicolaus Copernicus and afterward Galileo Galilei proved with their researches that we do not leave on a plate but on a potato. Not to mention what we’ve learned from a number of space missions and explorations made with satellites. By the way of digression, how would the Global Navigation Satellite Systems work if the Earth was flat? Hmm…