Mostly these days, it’s considered to be allegory, as apposed to firm fact. but people- typically Young Earth Creationist types- will insist the english-translated bible is the absolute word of god meant to be taken absolutely literally. (and will reject things like aging and dino bones because it was made to look that way. for some reason.)
there are some middle-ground type people who espoused a belief that there was a solid shell of ice- the firmament- and that it melted to create the cataclysm written of Noah’s flood to explain why it wasn’t there, but was there before.