Yes, the King James Bible is a must-read. This is not, in my opinion, negotiable.
Obviously some bits are much more important than others, and there's a lot of repetition, but don't mess about trying to save a few minutes here and there, just read it ALL, and then go back and re-read the key bits.
You do this, firstly because of its merit as literature in its own right.
But also because if you haven't read it, you really can't appreciate fully any serious literature that came after it.
Basically, most people who wrote anything after the KJB would have read it, and would have known it very well (i.e. lots of it by heart), and most important, *would expect that his readers would know it too*.
It's astounding how many references to it you notice once you're familiar with it.
Some of these are very obvious - e.g. exactly why did T.E.Lawrence call his Autobiography "The Seven Pillars Of Wisdom"?
But some are much more subtle. Here's just one example off the top of my head. In "The Silence Of The Lambs", after Hannibal Lecter escapes, he stays at an hotel. Harris writes something like this (I don't have the book handy so this might not be word-for-word, but it's pretty close) -
"The hotel suite seemed enormous to Doctor Lecter after his long confinement. He enjoyed going to and fro and walking up and down in it."
Well if you know your King James Bible that line just JUMPS OUT at you because it's from Job. Basically the devil is talking to God and God says "How did you get here?" and the devil says "From going to and fro in the earth and walking up and down in it".
Of course it's a big slog, and OK, you can skip a paragraph if it is just literally a list of names begetting other names, but you have to put the time in.
It's often said that Abraham Lincoln learned everything he needed about writing from the King James Bible and the Complete Shakespeare. OK, this is a bit of an exaggeration, but only a bit. Get to work! :)