There are a lot of people in this world. I'd be surprised if "being taught that from the beginning" was the only way to come to believe that the Bible contains the most important values.
Well, there are enough people in the world that there would have to be a couple who could come upon the Bible completely cold and think it the best book of morals ever written, but I would have to guess they are in the slimmest of minorities. Most people who believe the Bible, I would guess, are probably from countries where the Bible is already be lieved by many, forcably made to believe in it through indoctrination at a later time in life, or were in proximity to a small group of people who believed while living in a country that may not have that belief as a majority (China, Muslim countries, etc).
This may the argument from incredulity fallacy on my part, but I find it hard to believe there are many out there who are completely unaware of the Bible and who would think the morals portrayed therein were the be all and end all of morality when exposed to them in a neutral way.