A myth is 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. It is one that’s usually concerned with deities or demigods and explains some practice, rite, or phenomenon of nature. Myths are the glue that holds a culture together whether right or wrong.
When a myth is so obviously factually flawed it no longer beneficially serves those who embrace it; however, that’s not easily seen.
Unfortunately, America in particular is holding on to some dangerous myths that run the spectrum of societal thinking. The earth does not have an inexhaustible supply of raw materials. We cannot sustain a population of six billion plus with our current life styles. Newtonian physics is no longer the answer to all technologies and especially those in the medical field. The Darwinian concept of survival of the fittest must be abandoned. It doesn’t work and it’s not valid.
I need not remind us of the economic and political myths that are falling apart every day!
It is at the core though that the apple has become rotten, and thus few see it. The ethical lapses and false mythos that says we can stop killing by killing has never worked and can never work. The ethical breakdown of all of the world’s leadership is beyond comprehension.
However, for me the worst of all myths has been the dangerously dualistic heaven & hell one.
Be good and you are IN. Follow MY religious beliefs and you are IN. Practice THIS ritual and you are IN. But, if you do not do as I do, then you will go to hell. God is love but his patience runs thin, so the story goes. God is forgiving, but we have free will and God will banish us eternally should we choose wrongly. The most dangerous and divisive MYTH is that the Creator of the universe loves CONDITIONALLY!
Nearly as dangerous is the myth that we are somehow separated from God, separated from one another (race, gender, sexual preferences, etc.) instead of seeing that we are ALL ONE. However I treat you is how I am treating me. Think of how we’re treated “others”, be they individuals or groups. Is this really how WE want to be treated?
Now what? 
You speak a truth with gusto! Why is it that most traditional Christians cannot imagine the word myth and the phrase Bible stories being used in the same sentence?