The answer to that is very simple and easy to understand once you accept that the point of the story is IDEOLOGICAL, not historical.
Why tell me that? It is your fellow religious folk that believe the gospels, and even the whole Bible, is literal history. I suggest you set them straight.
So that when people accept the ideals the story presents them as true, they then also tend to accept the historical illusion as true, as well (the suspension of disbelief that accompanies all story-telling). Because they simply don't care about the historical aspects of the story being factual.
And can you understand that these people are adopting this type of interpretation as much as they are adopting the habit of religious belief?
YOU care about this because YOU ignore the ideological importance of the story, leaving you with nothing else but the history to focus on.
Is that right? What ideological importance am I missing? Have I ever denied that religious belief doesn't assign importance to various types of Christian ideology? Heck, I acknowledge the many tens of thousands of sects that each have their own "ideological importance". I make no bones about the fact that it is groups of Christians who have decided, or adopted, frameworks and ideas they deem important. Let's note they are important because their social community has decided they are imorrtant, not because they are naturally important.
Clean water and safe food is naturally important. Shelter is important. Health is important. The idea that "Jesus saves"? Well, it's important for the ego, and identity, and meaning, but disposable, and replaceable.
Even though that is not the purpose of the story and has nothing to do with it's validity. So for YOU, the fact that we can't prove the historicity negates the veracity of the story. But to everyone else, none of that even matters.
It's worse than not being able to prove the history" of the supernatural bits of the Jesus myth, it's that those elements are implausible. There is no data, no experiences, no observations of any supernatural phenomenon existing in our universe. It is VASTLY more likely that these elements were invented by humans at a time in history where embellishment and legend was common. I don;t deny that there are many humans who have unconsciously conformed to religion, and adopted ideas that they would not likley believe if they were presented outside the pressure of social experience. The Ashe experiments show how easily and quickly humans adopt untrue ideas from their peers, and religion is just the biggest example of this.
Welcome to the human condition. What DON'T we humans interpret individually and then debate and argue about?
The fact that cake is delicious.
Your comment here is your usual vague misdirection. If humans were uniformly wise, educated, emotionally intelligent, they would be seeking truth accross the board. Science leads the way in determining what is true about the universe. There is a way for we humans to determine true from false, and many have little interest in knowing what is true. Religion? Qanon? Biased media? Among other areas of human thought, there is a lot of work spent creating false and irrational conclusions about our human experience. Critical thinkers ahve an easier time with this, but the religious folk we debate have little interest in understanding how their religious beliefs are unlikley true as they believe it. They want the comfort of their illusion, and fight to maintain their prison of illusion even though they are shown the door to freedom. I find this really interesting. Is it that believers won't walk away from religion, or is there something they can't do anything about?