One Book Of Books
One of the seemingly clever tactics that atheists use against Christians, is when they claim that “using the Bible to prove the Bible,” is circular reasoning. At face value this familiar accusation appears to be valid, but there are a number of problems with this charge however. One glaring issue is that they’re looking at the Bible as the single completed book that it is today. As we know, it took over 1500 years for the Bible (all of the 66 books) to be written  and was penned by about 40 individuals .
I’m not going to get into all of the details of who wrote what books, how they were written, etc but needless to say, it was a tedious process. The Old Testament was written primarily on scrolls while most of the New Testament was written on loose papyrus, parchment, or paper . I would like to point out that when New Testament “books” of the Bible were written, they were first written as letters with no chapters and verses etc. In the 21st Century we forget this fact. These individual letters were then compiled into books, and later all of these books were compiled into the cannon that we know/have today. So to look at these letters from a perspective of the time period that they were written -as the individual documents that they were- we see many corresponding documents that were coming from various sources, not just one.