"Many (most? all?) Christians believe the snake was really Satan,"

Without meaning to nitpick, what percentage of people who call themselves Christians do you think actually believe this? I'm pretty sure most of my Christian friends don't believe that any of Genesis is literally true. They probably also don't believe that a man can survive for 3 days in the belly of a whale, or that donkeys talk (Numbers 22: 26-30). I'm not really sure how this is relevant here, except that maybe I'm trying to say that a talking snake is just so damned absurd that even people who say they believe it don't actually believe it.