Obviously you don't. For you just said "for it is all but a myth". You chalk up myth to be nothing but false or fairy tales apparently. Letting on that you don't know what the point of myth is. You, therefore, don't know the point of your very own Christian mythology and how to go about interpreting it. When you decide to study what myth really is and the reason behind it and what archetypes are and how they are used, perhaps you could better understand how to take certain things allegorically and metaphorically and how you can actually get more meaning that way than trying to take everything literally. When you do that, then perhaps you can come back and we can actually have a conversation. That is if you can not run away from me.
Here is how I understand a myth. It can be based on truth but may have had stuff added to it which has embellished the truth, perhaps to such a point that it very difficult to know which bit is the truth from which the myth developed.
However, here is how dictionary.com puts it:
myth
noun
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, especially 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.
So, as you can see, there are several ways to interpret even the word "myth"!