Bart Ehrman destroys Christianity in under 12 minutes.

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Even if they were written a mere 10 years after the events, that would still render them hopelessly unreliable. Even if it was eyewitnesses writing down their recollections.

And this is just about establishing the mundane details. There is no credible historical way to investigate unprecedented occurences, such as angels turning up or people ascending into heaven. You can't assign them any kind of meaningful probability. These are in fact good indicators that you are reading something which is at least partly fictional. Even Christians would, I expect, use this criteria for any other textual accounts.