That is only part of their possible truth however. I think myths are told and retold because they hold psychological truths, which are relevant today (see below).
You take a very literal attitude to truth earth! Myths are important because they are metaphors for aspects of life - i.e. psychological truths.
The Adam and Eve story, I think, is about the dawning of human self-awareness. Guilt and shame are an inevitable consequence. The serpent is often a symbol of change and transformation, (not necessarily evil).
There are human psychological truths to consider in this myth about the sources of our suffering in going from animal to human awareness, as well from childhood to adulthood.
Truth is not just about facts! That is the mistake the creationists make also.
Myth is more like superstitious beliefs allowing the imagination to run wild. Superstition is not much of guide, IMO. Myth is a fable that was told by those without knowledge of actuality. Today we call made up stories fables or fairytales. In the past myths became the truth representing reality while at the same time lacking evidence. If one desires to call fables/myths based in superstition truth then superstition is the guide and not reality. Myths are misleading notions causing fear in some cases. I don’t put much stock in myths described as truth. Myths sometimes cause people to think and behave irrationally especially when interconnected to Gods/religion.
Truth according to the dictionary.
1. the true or actual state of a matter: He tried to find out the truth.
2. conformity with fact or reality; verity: the truth of a statement.
3. a verified or indisputable fact, proposition, principle, or the like: mathematical truths.
4. the state or character of being true.
5. actuality or actual existence.
6. an obvious or accepted fact; truism; platitude.
7. honesty; integrity; truthfulness.
8. (often initial capital letter) ideal or fundamental reality apart from and transcending perceived experience: the basic truths of life.
9. agreement with a standard or original.
10. accuracy, as of position or adjustment.
11. Archaic. fidelity or constancy.
http://dictionary.reference.com/browse/truth
Myth:
1. a traditional or legendary story, usually concerning some being or hero or event, with or without a determinable basis of fact or a natural explanation, esp. one that is concerned with deities or demigods and explains some practice, rite, or phenomenon of nature.
2. stories or matter of this kind: realm of myth.
3. any invented story, idea, or concept: His account of the event is pure myth.
4. an imaginary or fictitious thing or person.
5. an unproved or false collective belief that is used to justify a social institution.