Look at it this way, if God intended the Bible to be a scientific journal, why does the Bible not tell us that the World is round? Why does the Bible not tell us that the Earth revolves around the Sun?
If the Bible was meant for the purposes you put it too, it is wholly and completely inadequate. Therefore: Your PURPOSE is not what God intended, since God would do a better job!
What the Bible does tell us, it tells us so that we learn how to live.
If the Bible contained things that the people, at the times of the various books, could not or would not believe, the Bible would not have survived as it has.
Maybe you should read it.
There are Bhuddist and Hindu writings that do that pretty well.
There are atheist Philosophers who have written books that do that as well.
If the only purpose of the Bible is to teach us how we should live, then why is the Bible special?
Why is the Bible a better book that this: