I forget where I read this, but even the Vatican was modeh (again, I forget to whom), that the accounts in their “New Testament” were essentially for hisorerus/illustration purposes and are not factual accounts, which means even they agree that there was no Immaculate Conception nor Virgin Birth, etc.
I would assume your average Christian and even your typical minister does not know this, despite the numerous raayos that those stories could never have happened.
But that’s okay, and besides the point, because they can believe whatever they want.
But the point is that our Torah is NOT any basis for, lihavdil, their beliefs.