I'd suggest everyone take note of C.I. Schofield's "Biblical Overview": http://www.biblestudytools.com...
"The Bible, incomparably the most widely circulated of books, at once provokes and baffles study. Even the non-believer in its authority rightly feels that it is unintelligent to remain in almost total ignorance of the most famous and ancient of books. And yet most, even of sincere believers, soon retire from any serious effort to master the content of the sacred writings. The reason is not far to seek. It is found in the fact that no particular portion of Scripture is to be intelligently comprehended apart from some conception of its place in the whole. For the Bible story and message is like a picture wrought out in mosaics: each book, chapter, verse, and even word forms a necessary part, and has its own appointed place. It is, therefore, indispensable to any interesting and fruitful study of the Bible that a general knowledge of it be gained.
First. The Bible is one book. Seven great marks attest this unity.
From Genesis the Bible bears witness to one God. Wherever he speaks or acts he is consistent with himself, and with the total revelation concerning him.
The Bible forms one continuous story--the story of humanity in relation to God.
The Bible hazards the most unlikely predictions concerning the future, and, when the centuries have brought round the appointed time, records their fulfilment.
The Bible is a progressive unfolding of truth. Nothing is told all at once, and once for all. The law is, "first the blade, then the ear, after that the full corn." Without the possibility of collusion, often with centuries between, one writer of Scripture takes up an earlier revelation, adds to it, lays down the pen, and in due time another man moved by the Holy Spirit, and another, and another, add new details till the whole is complete.
From beginning to end the Bible testifies to one redemption.
From beginning to end the Bible has one great theme--the person and work of the Christ.
And, finally, these writers, some forty-four in number, writing through twenty centuries, have produced a perfect harmony of doctrine in progressive unfolding. This is, to every candid mind, the unanswerable proof of the divine inspiration of the Bible.
Second. The Bible is a book of books. Sixty-six books make up the one Book. Considered with reference to the unity of the one book the separate books may be regarded as chapters. But that is but one side of the truth, for each of the sixty-six books is complete in itself, and has its own theme and analysis. In the present edition of the Bible these are fully shown in the introductions and divisions. It is therefore of the utmost moment that the books be studied in the light of their distinctive themes. Genesis, for instance, is the book of beginnings--the seed-plot of the whole Bible. Matthew is the book of the King, & etc. Third. The books of the Bible fall into groups. Speaking broadly there are five great divisions in the Scriptures, and these may be con- veniently fixed in the memory by five key-words, Christ being the one theme ( Luke 24:25-27 ). ........"
I certainly recommend following the link above for the full introduction to any of you who find the Bible truly incomprehensible, and to any of faith who have not seen it before. Simply one of the best overviews of the Bible I've ever encountered.