You can't have it both ways, you can believe on faith that the New Testament stories can be read literally, the Son of God rising from the dead and all, or evidence has to be provided to corroborate these stories, and the latter has never happened, so continue to believe if that's what you want to do but don't try to convince a neutral bystander that those stories about witnesses dying for the cause can be corroborated. Those mythological stories were written for theological purposes, not historical, and that is why.
For you the eyewitness accounts require corroboration.
What would that corroboration look like ? Is there some kind of physical evidence you would accept ? What would that be ?
There is none.
You say you know why the eyewitness accounts were written. Of course, you do not. You weren´t there, nor were you inside the heads of the eyewitnesses.
By faith you accept your ideas of the issue. Your worldview tells you it can be no other way.
You are not a neutral observer, your very statements show that you are a biased observer, your mind is made up, it can be no other way.
I understand, I was where you are in my past life, so there is hope for you.