Science said the earth was flat. As for talking snakes you and such things as that you would have to talk to God about that. Satan was an angel once who had a voice but Satan got proud and was a liar and booted out of heaven so started deceiving people he came to Adam and Eve in the form of a snake, he could come to you as the prettiest girl you've ever seen and you'd see her as just another face because satan plays on our weaknesses.