So I've listed ten myths that I at one point just believed when I first heard them, even if in some cases it was only when I was pretty young. I also wanted to put together a list of myths that never sounded plausible to me, even the ones I heard as a kid, but that somehow get passed around as if true (and in some cases even get trotted out as if any serious scholar must believe such a thing).
1. KFC changed its name from Kentucky Fried Chicken because they don't use chicken anymore. They use clones of chickens grown without heads, and the U.S. government won't allow them to call that chicken.
5. The Pentateuch was compiled over several generations by people with different and conflicting ideologies, and we can reconstruct which ideology is behind which verses or even partial verses with pinpoint precision, according to such tell-tale signs as which name is used for God or whether it happens to involve a negative or positive assumption or conclusion about a certain tribe of Israel. It amazes me how confident scholars can be of this even though no sources have ever been found for such texts, no textual statements in the text we have indicate anything about any such sources, and no two scholars can even agree on which parts come from which sources.
6. J.K. Rowling, author of the Harry Potter novels, is a practitioner of Wicca who sought to convert Christians to Wicca by writing novels about magic.
7. Sarah Palin cut funding for teen mothers because of pro-life convictions.
10. Divine foreknowledge and predetermination are incompatible with human freedom and responsbility. Sorry, I suppose I should find something less controversial. How about the commonly-heard line about how Jesus' statement that it's easier for a camel to get through an eye of a needle than for the rich to enter God's kingdom once you know that there's a gate in Jerusalem called the eye of the needle, and camels can get through it, but it's hard. (I once heard someone repeat that false background to Jesus's statement and then say that knowing that changed her life. Somehow. She never explained any further and probably couldn't have done so even at gunpoint.)