I've read the entire Bible as I think most Christians have;
Erm, my understanding is that reading the Bible is what tends to drive Christians to atheism. That's what happened with me. And I don't know of many Christians at all that have legitimately read the whole Bible.
Are you from a small Christian town or something?
(it is much easier than War and Peace and held my attention much more than Tinker, Tailor, Soldier, Spy...yawn).
OK.
It does "fit together" as a theological work.
Then why do people disagree on major issues, such as the existence of Satan and/or hell, and even the divinity of Jesus?
However, the Bible should not be judged on the accuracy of it's information as if it is a textbook on science, history or archeology, etc.
Why not? God could have made it accurate, and yet did not. Why would he do that?
Rather it should be judged on what it has to say about purpose of life, the meaning of the world we live in and the the reality that lies beyond it.
And the general meaning of life on Christian theology is what, exactly?
1.) God hates sin, or dislikes it, or cannot look upon it - however you want to phrase it.
2.) God already has means by which he can give all Christians an eternal, sinless existence while maintaining their free will (???).
3.) Unbelievers would have been better off not having ever been created, since most (or at least some) theologies insist that a fate worse than death awaits them for all eternity.
4.) Demons would have been better off not having ever been created for the same reason.
5.) Believers would have been better off created instantly in heaven by virtue of the simple fact that heaven>earth by any metric one can propose.
6.) Jesus would have been better off had 3.), 4.), and 5.) above been actualized because his death (and/or separation from God the father) grieved Jesus deeply to the point of physical distress, and he prayed for the old "anything but this."
7.) The only entities left in existence, on Christian theology, who don't vastly benefit from this are God and the angels who chose the right side. While they would not really gain anything from heaven having been populated with saints instantly, they certainly would not have lost anything.
8.) Therefore, there is no conceivable purpose to the existence of earth, unless God is either apathetic or malevolent.
9.) But God is benevolent, and therefore there is no purpose to the existence of earth whatsoever on Christian theology.
So when you say that the Bible tells you about the purpose of life, what in the world are you talking about?