What are the dubious facts passed on by word of mouth as traditional?

Answer 1

Your question makes no sense as you fail to describe which dubious facts you might be referring to.

In general though, oral tradition is not nearly so dubious as you might imagine as in cultures where it is done, those responsible for passing on this knowledge are highly trained story-tellers, much like actors on a stage.

Actors are highly trained to remember their lines and to present to an audience that which was in the mind of the playwright. Their ability to act and recall the tale is impeccable.

Even more highly trained are those who were entrusted with the history of a group or tribe. Many of these people trained for 20 years or more, simply to remember accurately the history and culture of a people. Their tradition was passed down through generations, wth each being required to remember more. Only people who were capable were chosen or called to this task. These traditions are considered as reliable as written tradition as even in written tradition, there is no guarantee that what was written is accurate. Also, much of written tradition is merely the initial penning of oral tradition.

Answer 2

We now call it the bible