This doesn't mean the truth gets preserved, just the winners' version of it. What we learn through history books and newspapers is strictly extracted from what our government tells us, suppressing anything that would paint us in a negative light.
The same could be said for the bible, only those idiots didn't have the morals yet to realize rape, genocide and murder could be interpreted as negative, mostly because they wrote the bible to reconcile the atrocities that they wanted to commit (and already had committed).
But, there's more to this angle. Christianity wasn't a huge lovefest where everyone agreed on the precepts and loved Jesus and his apostles. There were dissenting opinions, which is not surprising given how many denominations there are today.
So, the prevailing Christianity movement eventually took power, and quashed any stories or beliefs that didn't fit their goals. Look up Emperor Constantine and you'll find out how the bible came into existence. Constantine and his brain trust chose what would make it into the new testament, and rabbinical scholars did the same thing with the old testament.
Sound familiar? There's little difference between the U.S. president and his cabinet and Constantine and his cohorts, doing what they think is best for their sheeple. Some examples of books/stories that never made it into the bible are the Gospels of Judas, Thomas and Mary Magdalen, apocalypse entries and the story of Lilith.
Lilith? No, not the robotic, cold, monotoned character on Cheers (though this could be why the writers of that great sitcom named her as such), but the so-called first woman on earth.
This story arose from Jewish folklore and banned documents, but she was said to the first wife of Adam, made from the same dirt as Adam, long before Eve. But Lilith left Adam after she refused to become subservient to him and then would not return to the Garden of Eden after she mated with an archangel.
Basically she was independent and felt she was an equal, so it's no surprise this story didn't officially make it into Genesis. I say "officially" because if you read Genesis with a discerning eye you may catch a reference to her. Early on we read that god made man and woman at the same time, but then in Chapter 2 we learn Adam was alone and wanting a mate so god made Eve from Adam's rib.
This very likely was a reference to Lilith, but since that story was never told in the bible, they made the first woman Eve and the discrepancy was never caught or changed.
And how did man then treat Lilith, a woman with a mind if her own? They demonized her, saying she was responsible for things such as nocturnal emissions and miscarriages. The resulting Lilith legend is still commonly used as source material in modern Western culture, literature, occultism, fantasy and horror.
The same treatment can be ascertained with the Gospel of Mary, which described her as an equal to Jesus' apostles. But this wasn't included in the bible, and instead she was profiled as a prostitute. ... not as horrific as being made a demon, but just as misogynistic.
When I learned of these intentional omissions, it makes it all the more comical when someone says the bible is the word of god. Even when I clearly point out to these people that the word was not only embellished and inconsistent, but that men wrote every word, they just say those men were god's vehicle. And when they were burning stories they didn't want in the bible, that was god, too, right? And who was guiding the hand of the authors whose work was banned? Satan, right?
Like I said, to the victors go the spoils.