If you take any religilous book like the Bible or Koran, and removed every copy from the Earth, it would never be re-written.
This is plainly ridiculous. You probably think religion is just a cult of stupid people running around with a book, but its much more than that. While it's true that there are plenty of people who just say they're christian to "fit in" and don't actually care about religion, it's also true that there are plenty of people that are honestly devoted to their faith and would work hard to preserve it even if the costs were high. If that means rewriting the bible from memory, so be it. Obviously the wording would not be exactly the same because human memory is imperfect, but there are plenty of people who are knowledgeable enough to rewrite a part of the bible essentially accurately, and we'd just combine knowledge and we could probably get most of it down, although it might read more like an extended summary of the original text than the actual original text. And in any case, I imagine that we wouldn't be forced to search our memories, as in such a dire situation, it is perfectly plausible that god would simply choose to unilaterally create new copies of the bible.
You missed my point.
If we remove every bible from the planet and give all the Christian knowledge time to pass away.
Then we have a new generation of people with no knowledge of Christianity. The bible cannot be rewritten from scratch.
But a science text book can.
I am not saying religion is a bad thing. But god is a concept to help deal with the fundamental lack of knowledge that humans possess in ancient times.
