Well, let me try to answer these for you.
Yes, when a theory is shown to be wrong it should be modified or replaced.
But your addendum is where I think part of the problem lies.
And the modern civilizations don't have their own type of creation myth?
It just denies the spiritual and is called evolution. Remember it is still called "The Theory of Evolution".
There are three things here. First, Evolution and the Theory of Evolution do not deny the spiritual. They don't even touch on it. That's why almost every major Christian Sect has come out in favor of teaching the TOE and are opposed to the teaching of Classic Creationism.
Second, there is nothing in either Evolution or the TOE that conflict with religion, particularly Christianity. That's why in addition to the major churches, you find individuals here and at other boards who are Evolutionists and Christians.
Third, there is a vast body of supporting evidence for both evolution and the TOE. There is no supporting evidence for even a reinterpreted Creation Account. There is no evidence for changed timeframes, moving parts of the universe around, various light speeds, various decay rates, selective suspension of the rules. It is all but speculation.
Certainly you can believe anything you wish. I have never said someone should not. But to support your belief it helps to have something other than wild speculation, and that's all that I have ever seen from any classic creationists.
Aslan is not a Tame Lion