The Bible is as reliable or unreliable as you want it be. It's a pretty flexible book. You can use it to prove or disprove your belief. You can use it to knock sense into your kids (figuretive or literally). So if you want it to be reliable, it's reliable. The problem is convincing others of your ideas. So let's discuss your points and see if you can discover your bias towards the reliability of the Bible.
1. 40 men wrote it and they all have a common theme. The common theme is God. That's what the compilation is about. I can take over 100 books written in the last 200 years on the topic of American History, and they'll all have a common theme! I can do that with science, psychology, etc. Whoever put the Bible together had the idea in his mind that it should contain writings where God was a common theme. If you pick up 100 books on Greek Mythology since the times of Aristotle to the present time, you could find 100 authors over a 3,000 year span and they would all have a common theme too, right?
2. Let me make a quick prophecy, Bible style: in less than 100 years this great country of the United States will cease to be a super power. Is this a real prophecy or just good analytical skills?
3. If everyone lived by my morals, I believe the world would be a better place too. The main values of not kiling, stealing, etc. are universal and not unique to the Bible.
4. The Chinese have long known much about the scientific truths of our universe. So have the mayas, the egyptians, etc. It is our western view of civilization and history that assumes man has only gotten smarter over time and that we are the only ones that have any accurate scientific knowledge. The truth is, knowledge has come in phases, with great periods of enlightenment and great periods of idiocy. We often assume everyone throughout the ages has been as dumb as the primates in the dark ages. But the dark ages only occurred in Europe and people during that time and place were the dubmest in recorded history. So don't assume that because 500 years ago people thought the world was flat that 2,500 years ago they believed the same thing.
5. It's hard to know whether a person is honest when you interact with a living person. So all of the sudden is possible to read 50 pages from a person who lived over 2,000 years ago and know they were completely honest? If that were the case, should we all write our 50 pages to establish our honesty once and for all?
One of the greatest lessons of history that's even included between the lines of the Bible, is the mistake of worshiping the past and irgnoring the present. Few respected Moses during his tenure, but future generations worshiped him as the greatest prophet ever. The same with Isaiah, Jeremiah, and all others in the Old Testament. Even when the Messiah came most people didn't recognize him. They were so caught up in the past and in the details of the law that they completly missed him. So let's take that lesson from the Bible and leave the details and specifics of the past and focus on the present. Let's look for God's miracles all around us today, instead of arguing if biblical miracle #73 is accurate or not.
Just my opinion.