The Bible is a series of books that were written by many different authors over many centuries. Re-written and interpolated by later generations for their own purposes. The version we have today is the result of hundreds of editors, mis-translations and political agendas for hundreds of years.
There is no "one" message that ties all of those books together, other than the possibility of promoting the trap of monotheism through dogma.
Many of the early books in The Wave deal with specific sections of the Old Testament. What was going on in those Old Testament writings is very different than presented in current scripture. Laura's work and the C's sessions on that subject dig into many of the lost aspects that may have been intended in the original context for which they were written.
Reading, "From Paul To Mark", and carefully trying to understand the religious-political context of that time, is in my opinion, the best way to get a grasp on the meanings and events throughout the New Testament and how the ideas of the Old Testament contributed to the rise of Christianity and how it relates to our world today through Paul's message.