The reason it matters is because a lot of people who repeat these stories repeat them as truth.
That's because they accept the truth of the ideological ideal that they perceive the story is being used to convey and they confuse the truth of that ideal with the historicity of the story. But now so are you.
The solution is to help people understand that our stories are intended to be mechanisms for conveying our
idealizations of truth, not for conveying actual truth.
So when they "spread the Gospel" under the pretext that the stories are actual events, and once those who hear the gospel learn the stories are not actual events, they reject the entire gospel as falsehood.
Such confusion and dishonesty is almost always going to end up being counter-productive for we humans. And completely unnecessary in our trying to convey an idealized truth. We don't have to insist that Shakespeare was documenting history to learn many idealized truths from his stories. Nor will telling anyone that he was NOT writing historical documentaries inhibit anyone from recognizing those idealized truths. So that in the end, the whole insistence of historicity from either side of the exchange is silly and unnecessary.
However had the people spreading the gospel made it clear these stories are strictly allegory, and explain the message they bring, those hearing the message can accept it in a way it is supposed to be accepted.
Idealized truth is a difficult "message" to explain or convey. It's why we humans engage in artifice in the first place. The truth is infinitely complex and dynamic. And each human accesses it in their own way and on their own terms (from their own ideological perspective). Artifice allows for a far broader range of access than any collection of specific facts or explanation could. It's why art is such an important human endeavor. It's a kind of special language of it's own. Sort of like mathematics is.