Okay... let me try to spell it out nice and slow:
A long time ago there was a guy named Constantine. He was Emperor of a place called Rome, which used to be a city but conquered most of the areas of Europe, the Middle East, and North Africa. There was a small cult built around the teachings of an executed rebel named Jesus that was causing a fair bit of dissension in Constantine's Empire. Instead of persecuting and executing these madmen, as was the policy of previous emperors, Constantine decided to use the "Christian" cult to win his civil war and consolidate his power.
Upon winning the civil war - he appointed a clique of leading Christian madmen to select some of their holy writings as a "canon" and also defined several of the doctrinal disputes for them; including the Trinity and immortality of the soul. All of which was irrelevant to Constantine, he jsut wanted to reunify his fracturing empire.
The books that were picked were not declared "inspired" until much, much later. They were initially intended to be a Christian "reader" or a general synopsis of the complicated Egypto-Babylonian-Persian mystery cult that had adopted a huge dose of Greek philosophy on its way to coopting the monotheistic Judaic tradition. In a word, bullshit.
The Bible is a great book - it is inspiring and illuminating. It is also just a bunch of books written at different times for different purposes that were collected and chosen because they represented Imperial interests for Constantine's reign. That's why they seem to be coherent. They were handpicked for that purpose.
If you want to be saved, forget the Bible. It can't help you if you can't help yourself...